Change rebranded Onyx firmware questions

[mac_es]

Hello,

I own a Tagus Iris 2017 which is an onyx book, it should be an C67ML Carta with an enhaced battery (3000 mAh) It's resolution is 1024 x 758 with 212 dpi

It comes with a firmware based on 1.7.5 (I suppose), no google play...

So I began to look into flashing the Onyx ROM because of the updates to the reader...

Firstly I backup all my flash: backup, boot, cache, kernel, kpanic, misc, recovery, system, user and userdata with Android Tool.

Looking into the backup dump I can see that it's loader is RK3028ALoader(L)_V2.15_otp.bin, which I got from the net.

Another thing that caught my attention is that in the build.prop it stats:

ro.build.product=Tagus_C67MLCarta2
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=Tagus_C67MLCarta2-user 4.2.2 JDQ39 296 release-keys
ro.build.fingerprint=Tagus/Tagus_C67MLCarta2/Tagus_C67MLCarta2:4.2.2/JDQ39/296:user/release-keys

ro.sf.lcd_density=240

The first question is: How can I determine if I hace to flash Carta firmware or Carta2 firmware?

I have downloaded both 1.8.1 flashes and unpacked them, the main difference is the kernel but I can't determine if I must use the Carta2 firmware with a modified build.prop (dpi and so on) or the Carta firmware.

Also I can see that the 1.8.1 firmware brings a new Loader. In case of trouble I can downgrade the Loader to the original one? If no, I have unpacked the firmware so I can flash it with Android Tool without the Loader. The new ROM will work with the original Loader?

Another question is if I flash the parameter file it actually does a repartition? My parameter file is different from the 1.8.1, so I want to know if I can go back to my OEM ROM succesfully

If I flash with Android Tool what I have to do with the partitions which are not in the original firmware? I have to boot into recovery and wipe everything?

Also, I would like to change the system.img (I have modified and repacked succesfully, in theory at last) so I have changed the default, language, timezone, home page and adb enabled by default... Should I flash the original firmware and the the modified system image? Or I can flash it directly modified via Android Tool?

Thank you very much

[Pau.ReRi]

Hi,

I'm a Tagus Iris 2017 owner and I want to change the tagus firmware too and install Onyx.

Did you reach your objective and do you have a Tagus with Onyx firmware e-reader? Is it possible for you to write a step by step guide for people who aren't used to Android system operations?

Thank you very much!

[mac_es]

Hello,

Yes, I have the Tagus with the Onyx firmware.

First I recommended to backup your tagus firmware for the warranty...

To backup here you have some instructions (in spanish, sorry):
http://www.lectoreselectronicos.com/...l=1#post247875

Then update:

You have to download the 1.8.1 factory tools from onyx and flash it. It comes with an user manual for installing drivers and flashing.

After it, put the 1.8.2 update in the sdcard and apply the update.

Take care to pick up the C67 Carta firmware!

cheers