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[Q] Getting Jelly Bean 4.3 on Moto G LTE?

28th June 2014, 07:24 AM   |  #1  
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I understand the Moto G LTE never came with JB, but I'm curious what your thoughts on the possibility of taking the JB build for the regular Moto G and installing it on the LTE model?

The reason I'm asking is because I use to own the non-LTE Moto G. It came with KitKat out of the box, but through one of the great threads here on this site I was able to downgrade it to 4.3. The benefits for me were two fold, at least an additional 1-1.5 hour of screen on time, and most importantly the old webkit. I'm willing to sacrifice battery, but the lost of the old webkit is the most frustrating part. In a nutshell, The text reflow and zoom settings found in browsers such as Opera/Dolphin just don't compare to what I was able to get with webkit browsers that are not crippled by KitKat.

My thoughts on this matter:
- JB from the non-LTE Moto G is probably already 80% compatible with the LTE model
- Problem points: missing drivers for new radio and gyroscope.
- OS probably already supports sd card

I'm curious what your thoughts are on this? Has anyone tried flashing the Moto G JB rom on to the G? Is anyone working on JB roms for this phone?
28th June 2014, 06:08 PM   |  #2  
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Quote:
Originally Posted by StOrmCatz

I understand the Moto G LTE never came with JB, but I'm curious what your thoughts on the possibility of taking the JB build for the regular Moto G and installing it on the LTE model?

The reason I'm asking is because I use to own the non-LTE Moto G. It came with KitKat out of the box, but through one of the great threads here on this site I was able to downgrade it to 4.3. The benefits for me were two fold, at least an additional 1-1.5 hour of screen on time, and most importantly the old webkit. I'm willing to sacrifice battery, but the lost of the old webkit is the most frustrating part. In a nutshell, The text reflow and zoom settings found in browsers such as Opera/Dolphin just don't compare to what I was able to get with webkit browsers that are not crippled by KitKat.

My thoughts on this matter:
- JB from the non-LTE Moto G is probably already 80% compatible with the LTE model
- Problem points: missing drivers for new radio and gyroscope.
- OS probably already supports sd card

I'm curious what your thoughts are on this? Has anyone tried flashing the Moto G JB rom on to the G? Is anyone working on JB roms for this phone?

Why should devs work on 4.3? We have 4.4 and we'll have "L" soon

Sent from my SM-T210R using XDA Free mobile app
29th June 2014, 04:26 AM   |  #3  
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The lazy buggers, haha jelly beans feels like GB to ICS now.. No one wants it.. I guess there's the excitement of seeing " a update is available "
3rd July 2014, 10:16 AM   |  #4  
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Quote:
Originally Posted by StOrmCatz

I'm curious what your thoughts are on this? Has anyone tried flashing the Moto G JB rom on to the G? Is anyone working on JB roms for this phone?

It's an interesting thought. Have you unlocked the boot loader on your LTE model? If so, why not try flashing the main system partition from one of the stock Moto JB builds for the non-LTE G, clear your cache and userdata, try booting it, and see what happens? (I'd leave everything else untouched...radio firmware/baseband, bootloader, probably even the partition table.) My guess: assuming that the KK partition table on the LTE model has a space big enough to accommodate the system partition, it will probably boot up just fine. The question is going to be whether any of the radios (cellular or WiFi) work at all in the stock JB (included drivers might not work).

-- Nathan
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6th July 2014, 03:56 AM   |  #5  
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Quote:
Originally Posted by nlra

It's an interesting thought. Have you unlocked the boot loader on your LTE model? If so, why not try flashing the main system partition from one of the stock Moto JB builds for the non-LTE G, clear your cache and userdata, try booting it, and see what happens? (I'd leave everything else untouched...radio firmware/baseband, bootloader, probably even the partition table.) My guess: assuming that the KK partition table on the LTE model has a space big enough to accommodate the system partition, it will probably boot up just fine. The question is going to be whether any of the radios (cellular or WiFi) work at all in the stock JB (included drivers might not work).

-- Nathan

Unfortunately my bootloader is not unlocked. I'm kind of waiting it out a bit just in case I need warranty. However, it's definitely something worth trying when I decide to unlock and there is still no good alternative to the old webkit. Any ideas what the risks could be with a bad system partition? Is it possible for that to brick the phone or cause something irreversible? As it's I imagine just the OS software, I'd expect possibly a boot loop. But I'm not familiar enough to know if could cause other issues.
12th July 2014, 12:32 AM   |  #6  
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Quote:
Originally Posted by StOrmCatz

Any ideas what the risks could be with a bad system partition? Is it possible for that to brick the phone or cause something irreversible?

I don't see how. You aren't touching anything especially low-level. You would be leaving the bootloader alone, the partition table alone, the modem/baseband firmware alone...if the system image from the non-LTE version cannot boot for whatever reason (likely lack of proper hardware support for whatever is different), you would just force it back into fastboot mode and reflash the system image you were using before.

Oh, you will probably also need to flash over boot.img (which is the Linux kernel, not the bootloader...bootloader is motoboot.img) in addition to system.img, since the two are generally paired together. But, again, I can't fathom how a bad kernel could brick the phone. Just flash back boot.img and system.img from the stock Moto G LTE release you were on before, and everything should be back to normal.

If you ever end up trying this, please report back and let us all know how it went. I will be most curious to know if it works.

-- Nathan
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20th July 2014, 11:21 PM   |  #7  
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Quote:
Originally Posted by nlra

I don't see how. You aren't touching anything especially low-level. You would be leaving the bootloader alone, the partition table alone, the modem/baseband firmware alone...if the system image from the non-LTE version cannot boot for whatever reason (likely lack of proper hardware support for whatever is different), you would just force it back into fastboot mode and reflash the system image you were using before.

Oh, you will probably also need to flash over boot.img (which is the Linux kernel, not the bootloader...bootloader is motoboot.img) in addition to system.img, since the two are generally paired together. But, again, I can't fathom how a bad kernel could brick the phone. Just flash back boot.img and system.img from the stock Moto G LTE release you were on before, and everything should be back to normal.

If you ever end up trying this, please report back and let us all know how it went. I will be most curious to know if it works.

-- Nathan

Thanks Nathan for the helpful responses! I have decided to go a different route and customize a KitKat rom with the classic 4.3 webview. I figure when the time comes, it'll be easier to go with supported Android versions than going backward. As there are no custom roms yet available for the Moto G LTE, I've instead made one for the non-LTE variant based on CM11. I've made a thread here looking for people to try it out: http://forum.xda-developers.com/moto...assic-t2822006
Last edited by StOrmCatz; 20th July 2014 at 11:25 PM.

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