boyjmn1 wrote:Thx for reply zulu99,
i am not sure if i have got all your points as i am feeling lame in some things. these things about old and new bootloaders...Is it so, that when i upgrade/flash new firmware - etc. 3.0-to 3.2 it updates bootloader version (and its features) also ? So its 3.2 bootloader and system after update, right ? Then it should not be possible downgrade to 1.2 version ? But i did it. i have had 3.2 version updated on start. then i tried to push there 1.1 version and flash proccedure was correct and without errors (so i have aplied old system on new bootloader, right ?) and it allowed me go thru. BUt after downgrade, as i said, it freezes during boot. So i assume, there is still new version of bootloader or ? Is it so that you can changing versions of bootloader both ways, or only up and then when you try downgrade, you mess up the system ? ? Sorry if it sounds chaotic and messy, but i wanna rly to understand main principes of this proccedure some easy way, if possible.
and next question.
Install twp manually - what is it and how ?
fastboot flash recovery the_last_mm_twrp.img - what is it and where to get it ?
The rest of solving steps i can understand.
About twrp, how to install and others things you can read the first post.
For the bootloader question, you need a working 3.2 stock firmware to install full Android 1.4
When you update with the OTA ( over the air update of Nvidia ) you have a complete installation. For this reason i suggest to install the last OTA with TWRP in case you downgrade.
To better understand, open the OTA zip and open the recovery firmware zip and you can see that the OTA have also others things inside. Mainly bootloader and factory stuff.
So the best way to install full Android is, have the last stock firmware installed and change only the system and vendor images with fastboot.
In the past, when you downgraded to Android 5.1 from Android 6, you can't upgrade only with the recovery firmware. You need the OTA. So i assume is the same thing also with others very old firmwares.