Lenovo (and other MTK) File checksum (Checksum.ini) explained

[BouRRi_GSM]

Hello
anyone now how to calculate file checksum and witch type of checksum is this.
i get succes calculation md5 checksum. but don't know about this type of checksuom

from checksum.ini in mtk flash folder:

exemple:
[CheckSum]
preloader=0xCB45
recovery=0x913E
efuse=0x256B
md1img=0xDCE4
md1dsp=0x390F
md1arm7=0xBC8E
md3img=0xB7E2


thx in advance.

[Brka]

There is public software called "MTK Checksum PC Memory Buffer", together with full source code.

Your shown example is not md5 (CHECKSUM_V2 in Checksum.ini file), but (if I got it well) byte checksum - ByteSum


About Checksum_Gen - usage : put exe and dll files in ROM folder,

- if you want just V1 checksum, run exe - it will make V1 checksum.
- if you want V1+V2 checksum - use switch "-md5" (yes, V2 is MD5 ...)

example on some Lenovo A380T flash file :

- V1 / CheckSum_Gen.exe

[VERSION]
VERSION=V1
TOOL=v5.1708.00
Change_ID=1491189569
[IsEnableChecksum]
CHECKSUM_SWITCH=1
[CheckSum]
PRELOADER=0x4D48
MBR=0x092A
EBR1=0x0941
UBOOT=0xC574
BOOTIMG=0x5B48
RECOVERY=0xB7D2
SEC_RO=0x146B
LOGO=0x1707
ANDROID=0x967F
CACHE=0x4571
USRDATA=0xB9AB

- V1+V2 / CheckSum_Gen.exe -md5

[VERSION]
VERSION=V2
TOOL=v5.1708.00
Change_ID=1491189164
[IsEnableChecksum]
CHECKSUM_SWITCH=1
[CheckSum]
PRELOADER=0x4D48
MBR=0x092A
EBR1=0x0941
UBOOT=0xC574
BOOTIMG=0x5B48
RECOVERY=0xB7D2
SEC_RO=0x146B
LOGO=0x1707
ANDROID=0x967F
CACHE=0x4571
USRDATA=0xB9AB
[CheckSum_V2]
PRELOADER=E7927A3B-780F1FD8-CEE00E52-F26BA605
MBR=24F60E82-B34C338F-7BC4F8A7-47DE5621
EBR1=3016BA41-DA806252-943587E6-EAA0F124
UBOOT=68908F89-4A9E3897-518067CB-57503DBF
BOOTIMG=DEB454BD-ED158CF8-590710C3-23686E9E
RECOVERY=DC92811B-22CC13F3-D59AC45F-3AB4176D
SEC_RO=4F307DFC-826C45EC-CE841AFE-9F3D2281
LOGO=A737B1F4-15DB1A8B-9E9B5D46-557BF882
ANDROID=0359BCAE-3AE46C18-67985F4F-A26953F2
CACHE=543D01BC-55FFA005-E76E87C6-C9CF331E
USRDATA=C418A8A0-0379A862-04A5B703-C7263DA4

ORIGINAL Checksum.ini (from ROM archive "target_bin" folder :

[VERSION]
VERSION=V2
[IsEnableChecksum]
CHECKSUM_SWITCH=1
[CheckSum_V2]
PRELOADER=E7927A3B-780F1FD8-CEE00E52-F26BA605
UBOOT=68908F89-4A9E3897-518067CB-57503DBF
LOGO=A737B1F4-15DB1A8B-9E9B5D46-557BF882
BOOTIMG=DEB454BD-ED158CF8-590710C3-23686E9E
RECOVERY=DC92811B-22CC13F3-D59AC45F-3AB4176D
SEC_RO=4F307DFC-826C45EC-CE841AFE-9F3D2281
ANDROID=0359BCAE-3AE46C18-67985F4F-A26953F2
USRDATA=C418A8A0-0379A862-04A5B703-C7263DA4
MBR=24F60E82-B34C338F-7BC4F8A7-47DE5621
EBR1=3016BA41-DA806252-943587E6-EAA0F124
CACHE=543D01BC-55FFA005-E76E87C6-C9CF331E
[CheckSum]
PRELOADER=0x00004d48
UBOOT=0x0000c574
LOGO=0x00001707
BOOTIMG=0x00005b48
RECOVERY=0x0000b7d2
SEC_RO=0x0000146b
ANDROID=0x0000967f
USRDATA=0x0000b9ab
MBR=0x0000092a
EBR1=0x00000941
CACHE=0x00004571

All should be clear now ...

p.s. Now you can "mix" files from different rom packages, which will download normally, without "DL Image Failed",
and without SPFlashTools complaining about non-matching checksum ...

p.s.2 I changed thread name to have more sense, since it's for MTK in general, not just Lenovo, also I put it as Sticky thread.


b.r.
Alex

[BouRRi_GSM]

Hello. Thank you very much.
I know v2 checksum is md5 and can be calculated with online calculator.
Im asking about V1 checksumand i get succes with checksum_gen.exe but is not support all file name then cant calculate all file checksum in newer phone.
So if someone need nvram.bin chechsum like me , just rename it for exemple to logo.bin and put it in the same folder with checksum_gen.exe .

****** EDIT:

Sorry i use old version of checksum_gen. Newer version can check all file from scatter, so dont need rename anything.

About v2 checksum, idont understand use switch -md5? With checksum_gen? How, Can u be more clear?

[Brka]

Either from command prompt, CheckSum_gen.exe -md5
Or by creating shortcut in windows and editing it, and add -md5

B.r
Alex