rmx3231

[Denzy7]

rmx3231 uses android 11 but padded to 00 40 00 00. should i use padding for android 9?

$ hexdump -C vbmeta-sign.img | tail
00003c90  e1 9f 67 a1 01 48 bb 07  00 00 00 00 00 00 00 00  |..g..H..........|
00003ca0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
000ffe00  44 48 54 42 00 00 00 00  16 b4 77 28 b0 86 25 e1  |DHTB......w(..%.|
000ffe10  f7 eb 56 fc 9b cb 5c 3e  f4 a7 c6 12 a9 70 e9 bf  |..V...\>.....p..|
000ffe20  b5 3e 1c 00 29 02 ee 70  00 02 00 00 00 00 00 00  |.>..)..p........|
000ffe30  00 40 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |.@..............|
000ffe40  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00100000 

[TomKing062]

use android 9 actually it is the (alignment with 0x1000) size of vbmeta generated by avbtool, can be different with original vbmeta

[Denzy7]

ok. its now padded. how do i sign boot.img?

[Denzy7]

I used pacextractor to extract stock boot.img which i patched with magisk. python avbtool info_image --image boot.img had this to say:

Footer version:           1.0
Image size:               67108864 bytes
Original image size:      29313024 bytes
VBMeta offset:            29315072
VBMeta size:              2304 bytes
--
Minimum libavb version:   1.0
Header Block:             256 bytes
Authentication Block:     576 bytes
Auxiliary Block:          1472 bytes
Public key (sha1):        9405a8f24d5b71da4420fa3edc5a5bd2e7420446
Algorithm:                SHA256_RSA4096
Rollback Index:           0
Flags:                    0
Rollback Index Location:  0
Release String:           'avbtool 1.1.0'
Descriptors:
    Hash descriptor:
      Image Size:            29313024 bytes
      Hash Algorithm:        sha256
      Partition Name:        boot
      Salt:                  90aa4abfa3c379688515ae02967afc4c00ed47b531652d3881822b0f7fd0e8b8
      Digest:                a675a9a930b0d9019643df49c395e3d7670299356ed26d7e9ac7f33ed821ccfa
      Flags:                 0
    Prop: com.android.build.boot.fingerprint -> 'realme/RMX3231/RMX3231:11/RP1A.201005.001/1660721239064:user/release-keys'
    Prop: com.android.build.boot.os_version -> '11'

i then patch it with magisk, sign with python avbtool add_hash_footer --image boot_magisk_patched.img --partition_name boot --partition_size 67108864 --key rsa4096_vbmeta.pem --algorith SHA256_RSA4096

then this is the output of signed magisk boot.img:

Footer version:           1.0
Image size:               67108864 bytes
Original image size:      29550592 bytes
VBMeta offset:            29552640
VBMeta size:              2112 bytes
--
Minimum libavb version:   1.0
Header Block:             256 bytes
Authentication Block:     576 bytes
Auxiliary Block:          1280 bytes
Public key (sha1):        2597c218aae470a130f61162feaae70afd97f011
Algorithm:                SHA256_RSA4096
Rollback Index:           0
Flags:                    0
Rollback Index Location:  0
Release String:           'avbtool 1.2.0'
Descriptors:
    Hash descriptor:
      Image Size:            29550592 bytes
      Hash Algorithm:        sha256
      Partition Name:        boot
      Salt:                  d81c698452c19c17b0b3a111503b8ba5b309794ae37b324ccea9112398c3aca1
      Digest:                58d0d485cbf84be59a356d3e201fb96e09a38a08b3a23990c97e06f339d13726
      Flags:                 0

hovatek guide

but flashing it with research download causes it to get stuck at vbmeta. even using the extracted vbmeta from pacextractor also gets stuck. here is the rom i used

[edit] also realme refused to provide in depth apk to unlock bootloader for rmx3231 could this be the issue?

[TomKing062]

on android 10(+), after unlock bootloader, trustos only check boot is signed, and will not check signer of boot. boot can be flash with researchdown or fastbootd or spd_dump

sign vbmeta is not a necessity to get root, there is a way to boot with custom signed vbmeta, but not work on 9863s yet, https://github.com/TomKing062/CVE-2022-38691_38692/issues/1

[Denzy7]

i flashed magisk boot.img with research tool and got boot loop with stock vbmeta that came with stock rom. plus i cant use fastboot with locked bootloader since realme haven't given us in depth tesk apk i want to try spd_dump but idk if it will work anyway

[TomKing062]

https://github.com/TomKing062/CVE-2022-38694_unlock_bootloader/releases

[Denzy7]

so will this work on 9863 otherwise my main concern is root. how can i root this phone??

[TomKing062]

bl unlocked, patched boot signed, what else get in the way ?

[Denzy7]

it worked bro! i however had to flash stock vbmeta with disable flags and flash magisk boot with fastboot (which caused bootloop?) then flash stock vbmeta with download tool. thanks alot