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ClockworkMod (CWM) Recovery easy install for RK3066 and RK3188 -- TWRP/CWM Flash-Tool and root for RK3288

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Cube U30GT2 Android 4.4.2 KitKat custom root firmware - test overclocked kernels
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Wintermute
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2014/02/21 - 17:53
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maikal said
Wait, there is already a "Custom Beta 2" rom for 442?

I saw the post on that last update from 51.cube, but I did not see a custom 2 made from it!

Yeah I mean the one posted in 4.4.2 thread recently. It's more like a custom/modded version of former beta 1. Comes with some Chinese apps and no root.

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maikal
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2014/02/21 - 18:00
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Wintermute said

maikal said
Wait, there is already a "Custom Beta 2" rom for 442?

I saw the post on that last update from 51.cube, but I did not see a custom 2 made from it!

Yeah I mean the one posted in 4.4.2 thread recently. It's more like a custom/modded version of former beta 1. Comes with some Chinese apps and no root.

 

The one that came out a few days ago in the chinese sites? Posted 2 or 3 pages back in the 442 thread? Okay, if thats the one you are talking about I'm not on that one. Am on the original Kasty 4.4.2, with no multi-user mod, that was the first one, they later added the multi-user mode, but I do not care for it since I am the only tablet user in my home. I am waiting to see what our folks do with that chinese update first.

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Burs
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2014/02/21 - 18:15
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DarthJabba said
if you run the RKAndroidTool, it should see the tablet, and you will easily be able to flash with it a safe kernel (e.g., the stock one, or T14) - just make sure that the bootloader and the parameter file are ticked, and that the right kernel image is selected (and the kernel is also ticked).

Are you sure that flashing bootloader and parameter files are neccessary? When I was flashing your first OC kernel over custom beta1, I just marked a new kernel to be flashed and everything went ok...?

Wintermute said
Just stopping by to report a successful flashing of top clocked T15 kernel on my 4.4.2 "custom beta 2". Have managed to flash it using RKAndroid just fine.

Have you flashed only the kernel, or bootloader and parameter files too? Also can you give the exact link for custom beta2, because I have at least 3 beta2's which claim they are beta2, so now I don't even know what is what :) I might give it a second try with T15@720Mhz. If it doesn't work again, I might flash your beta2 and try with it.

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2014/02/21 - 19:02
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Burs said

DarthJabba said
if you run the RKAndroidTool, it should see the tablet, and you will easily be able to flash with it a safe kernel (e.g., the stock one, or T14) - just make sure that the bootloader and the parameter file are ticked, and that the right kernel image is selected (and the kernel is also ticked).

Are you sure that flashing bootloader and parameter files are neccessary? When I was flashing your first OC kernel over custom beta1, I just marked a new kernel to be flashed and everything went ok...?

It may not be necessary (unless when you are un-bricking), but it won't do any harm.

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2014/02/21 - 19:11
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OK, I gave it another try, but this time with power cable connected and fully charged. No luch either. Even worse. After first restart (after kernel flashing) it got into bootloop, but after 3-4 tries, it managed to reboot into recovery mode. But after second reboot - black screen and no signs of life. I revived it using RKAndroidTool. I also tried to flash the kernel from there (without parameter/bootloader), but this time it was stuck on first Cube logo and not doing anything. So now I have 1.8@stockDDR again. At least it's booting http://www.arctablet.com/blog/wp-includes/images/smilies/icon_smile.gif I'll call it a day, untill DarthJabba cooks something else http://www.arctablet.com/blog/wp-includes/images/smilies/icon_smile.gif

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DarthJabba

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2014/02/21 - 19:49
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To be honest, I think we're on a hiding to nothing here. The only time I have experienced problems like this was when I tried to OC the JB 4.2.2 kernel DDR to 800mhz. This confirms something we have always suspected - i.e., all Cubes are not equal. But perhaps we should try to ensure first that we are on a level playing field. I am using the original Kasty 4.4.2 (i.e., the one without the multi-user stuff). Is this what everyone else is using?

 

PS: I will upload later the T15 kernel with stock DDR, just to eliminate the possibility that the reduced voltages is not the real problem. At the moment, we are assuming that the problem is with the overclocked DDR - but we need to ascertain that this is truly the case.

 

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2014/02/21 - 20:07
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DarthJabba said
I am using the original Kasty 4.4.2 (i.e., the one without the multi-user stuff). Is this what everyone else is using?

I'm using the rom posted in 1st post of this thread.

DarthJabba said
PS: I will upload later the T15 kernel with stock DDR, just to eliminate the possibility that the reduced voltages is not the real problem. At the moment, we are assuming that the problem is with the overclocked DDR - but we need to ascertain that this is truly the case.

OK, I'll test it as soon as you upload it. But could you simply up the DDR voltage a bit (for 720Mhz), or loosen the timings or something? Ofcourse if you found their offsets in .img file too...

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2014/02/21 - 20:13
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DarthJabba said
To be honest, I think we're on a hiding to nothing here. The only time I have experienced problems like this was when I tried to OC the JB 4.2.2 kernel DDR to 800mhz. This confirms something we have always suspected - i.e., all Cubes are not equal. But perhaps we should try to ensure first that we are on a level playing field. I am using the original Kasty 4.4.2 (i.e., the one without the multi-user stuff). Is this what everyone else is using?

 

PS: I will upload later the T15 kernel with stock DDR, just to eliminate the possibility that the reduced voltages is not the real problem. At the moment, we are assuming that the problem is with the overclocked DDR - but we need to ascertain that this is truly the case.

 

Yup thats the one I am using also DarthJabba. Original 4.4.2 with no additives as they say. Have no use for multi-user. But I will fully load my battery up, and i will insert with the cable.

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2014/02/22 - 00:45
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Ok, here are 3 different "T15" O/C kernels (attached), each with stock DDR.

Let me know how you go with each of them. If every one of them works, then we will know that the problem is with overclocking the DDR, not with the T15 specs.

Thanks.

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2014/02/22 - 04:33
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Okay, trying them now. Will report as i go!

 

After 30 minutes, first one just kicked me off, restarted twice. I rebooted to recovery and it froze there. I had to power off. Refused first restart to recovery, Second attempt at recovery fine. I have moved on to second kernel on the list.

 

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2014/02/22 - 05:34
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Okay, trying them now. Will report as i go!   After 30 minutes, first one just kicked me off, restarted twice. I rebooted to recovery and it froze there. I had to power off. Refused first restart to recovery, Second attempt at recovery fine. I have moved on to second kernel on the list.  

 

Okay, that one, the second on the list, lasted less time before force closing all the way, and rebooting back. this time while i was running antutu. Going to give it the full 30 minutes to see if it repeats again. if so, i will replace with next one. If not i will wait it out until tomorrow and see what else happens.

 

Just wanted to add. the last t15 was a very rough ride, with fc's and reboots that were even scarier than the one I called scarier also. Did not last the night. i reverted to the original t14.

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DarthJabba

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2014/02/22 - 09:14
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Ok, perhaps the problem is with T15.

Here are some T14 samples (attached), with variously clocked DDR. If these are not stable also, then I'll just abandon this project, and keep using them myself. They all work here, so I am not sure why they are causing problems elsewhere!

 

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2014/02/22 - 15:13
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DarthJabba said
Ok, perhaps the problem is with T15.

I wouldn't say so, at least on my end. I tried all of your 8 new kernels and only the ones with DDR set to 720Mhz (T14's) keep failing. Here are my results:

1) kernel_305kitkat_cpu1800_t14_gpu768h_ddr460 ok
2) kernel_305kitkat_cpu1800_t14_gpu768h_ddr600 ok
3) kernel_305kitkat_cpu1800_t14_gpu768h_ddr667 ok
4) kernel_305kitkat_cpu1800_t14_gpu768h_ddr720 reboot after sleep
5) kernel_305kitkat_cpu1800_t14_gpu768h_ddr720_ex bootloop
6) kernel-305kitkat_cpu1800_t15_gpu768_t15_ddrstock ok
7) kernel-305kitkat_cpu1800_t15_gpu768h_ddrstock ok
8) kernel-305kitkat_cpu1800_t15_gpustock_ddrstock ok

4th kernel is very promising, because it's very stable at everything I throw on it, but when the screen goes off (when tablet goes to sleep), is always reboots instantly. So it could be that the voltage for standby frequency is set a bit too low? Could you try increasing it a bit, so I can test that too?

Now I'm on 3rd kernel which gives me score of ~20600 in AnTuTu (highest among 5 consecutive tests). That's about the maximum I saw on my tablet, so I'm very happy with it. The UI is much better, but still not as in 4.2. It could be due to many many apps that I've installed, so it could be just me.

BTW, what is the difference between 4th & 5th kernel, and 6th & 7th kernel? And what is the core difference between T14 and T15? Could you apply T14's frequency table to T15? I think T15 just needs some fine tuning.

That's all from me for now. If I can be of any more help, just say the word.

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2014/02/22 - 18:23
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Ok, thanks. All 8 work perfectly fine here, as do all the T15 kernels.

Difference between #4 and #5 relates to slight differences between the highest two frequencies (720256 versus 720001, and 667001 versus 667256 - in both cases, #5, then #4), and the voltages of the lowest frequencies.

#6 and #7 relates to lower GPU voltages in #6. #7 has the GPU voltages we've been using since 4.2.2.

The difference between T14 and T15 lies in the lower voltages for the CPU and GPU frequencies (trying to reduce heat and battery drain). If T15 is fine-tuned, it just ends up being the same as T14, so one might as well stick with T14 for public use. I will stick with T15 for my own use, because I get Antutu scores of over 21,000 with ddr667, ddr720, and ddr720_ex. The last one is the highest (21,452) - but the other two are just about 200 lower, so I might as well abandon ddr720_ex. There's very little difference between ddr720 and ddr667, so perhaps there is no point keeping ddr720 (especially if it is unstable).

I will try a few new schemes for ddr720, and will post them shortly. Perhaps we will be able to find one that is stable for you.

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2014/02/22 - 19:05
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Here are a few more O/C "T14" kernels, all overclocked at ddr720. Some are at gpu798 and some are at gpu768. The gpu798 kernels should get you to 21000 antutu (if they prove stable).

Let me know how you fare with them! Thanks.

 

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