ShaunMT's Modified ROM for Nextbook NX785QC8G (Support Thread)

[mel4787]

My moto g gets me a day and a half on battery. So Ik we can tweak the battery a bit

[shaunmt]

OK. So how we gonna get these tablets to not use much battery

The battery consumption seems typical of a budget android tablet to me...

Regarding the inaccurate battery level reporting... I don't have any ideas... I doubt we'll ever see a fix...

ShaunMT

[mel4787]

OK. So how we gonna get these tablets to not use much battery

[shaunmt]

Darn so that means we can't build a kernel for this device?

This device, someone (not me... I don't have time to learn kernel development) might be able to build a kernel... We don't have specific kernel configs, but we have Rockchip source from other devices and they tend to be pretty similar, but I wouldn't count on it...

ShaunMT

[mel4787]

Darn so that means we can't build a kernel for this device?

[shaunmt]

I see. Well with 1gb for apps its too small for me to put anything on. And I cannot access the name flash to move my apps to

I'm well aware... every Nextbook model I've ever worked on had a tiny /data partition and large /sdcard partition...

At least it's controlled by a parameter file on this tablet.... all of the Amlogic models had the partition locations and sizes hard coded inside the kernel... impossible to change without building a custom kernel and no kernel source code available...

ShaunMT

[mel4787]

I see. Well with 1gb for apps its too small for me to put anything on. And I cannot access the name flash to move my apps to

[shaunmt]

Yes changing the size of the internal storage since only 1gb is all we have for apps

I've successfully changed the sizes of my internal /data and /sdcard partitions, It's just a pain to install the changes... It currently requires either flashing each part of the ROM separately from a PC, or flashing from stock recovery and rebooting 3 times. First boot fails because /data and /cache moved and didn't get wiped correctly by stock recovery. Reboot to recovery and wipe /data and /cache then boot into Android, but /sdcard still needs to be reformatted to get the new size, requiring another wipe of /data, /cache and /sdcard...

I'm hoping to reach a point where anybody can just flash the desired ROM from the tablet the same way they would on any other device.

ShaunMT

[mel4787]

Yes changing the size of the internal storage since only 1gb is all we have for apps

[shaunmt]

Yay. Now the next phase is to find a way to merge nand flash to internal storage.

nand flash IS internal storage...

I think you meant either changing the partition sizes of the internal storage, or using the external SD card as internal storage?

[mel4787]

Yay. Now the next phase is to find a way to merge nand flash to internal storage.

[shaunmt]

Hmm how much of this device have you deciphered

A bit...

There are a lot of tools available for working with rockchip ROMs.

Unpacking and repacking a Rockchip ROM is easy.

Modifying the parameter file is fairly simple.

I compiled a working TWRP recovery tonight. (Working does not mean it is ready for release...)

Here's what's at the top of my todo list currently:

• Test and Tweak TWRP.
• Attempt to add rockchip update.img support to TWRP
• Assuming the above goes well... Release new ROMs with TWRP Recovery and optional partition layouts.

ShaunMT

[mel4787]

Learning as I go... this is the first Rockchip device I've worked on. There are a lot of differences between rockchip and the amlogic devices I was working on previously.

Hmm how much of this device have you deciphered

[shaunmt]

hmm do you have a knowhow on bootloaders and partitions or android

Learning as I go... this is the first Rockchip device I've worked on. There are a lot of differences between rockchip and the amlogic devices I was working on previously.

[mel4787]

I'm not familiar with the nexus devices and I'm not entirely sure what you mean, but I believe you can specify anything in the parameter file as long as you do it correctly and update the bootloader command line to match where necessary...

ShaunMT

hmm do you have a knowhow on bootloaders and partitions or android