Following instructions, cannot get any useful commands to go through. For my example,

MISC READ/WRTE ISSUES about lglaf HOT 1 OPEN

P3nguin-M commented on September 14, 2024

MISC READ/WRTE ISSUES

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Comments (1)

runningnak3d commented on September 14, 2024

You aren't putting a ! in your command. It would be -c '!MISC WRTE blah blah'

Your second problem is that you don't specify the offset OF the misc partition, you specify an offset WITHIN the misc partition. MISC WRTE and MISC READ already know the offset of misc.

So if you want to start writing at the beginning of misc:

!MISC WRTE,0,4 TEST

That will write TEST at the very start of the misc partition.

You can read it back with:

!MISC READ,0,4
And you will get TEST back. Here is output from my phone:

71° [swango:~/dev/lglaf] h932-dd-write(+1/-1)+* 8s ± ./lglaf.py --cr --debug --rawshell
LGLAF.py: DEBUG: product id in CR list: >G4<
LGLAF.py: DEBUG: Device is: 633a, G4. Enabling Challenge/Response!
LGLAF.py: DEBUG: Using endpoints 83 (IN), 02 (OUT)
LGLAF.py: DEBUG: Using Protocol version: 0x1000004
LGLAF.py: DEBUG: CR detection: 1
LGLAF.py: DEBUG: Hello done, proceeding with commands
LGLAF.py by Peter Wu (https://lekensteyn.nl/lglaf)
Type a shell command to execute or "exit" to leave.
# !MISC WRTE,0,4 TEST
LGLAF.py: DEBUG: Header: b'MISC' b'WRTE' b'\0\0\0\0' b'\x04\0\0\0' b'\0\0\0\0' b'\0\0\0\0' b';i\0\0' b'\xb2\xb6\xac\xbc'
# !MISC READ,0,4
LGLAF.py: DEBUG: Header: b'MISC' b'READ' b'\0\0\0\0' b'\x04\0\0\0' b'\0\0\0\0' b'\x04\0\0\0' b'\xc2+\0\0' b'\xb2\xb6\xac\xbc'
TEST#

Now without all the debug output:

Type a shell command to execute or "exit" to leave.
# !MISC WRTE,0,4 1234
# !MISC READ,0,4
1234#

Unless you have a backup of your misc partition, you NEVER want to write more than one block unless you are trying to modify values on the misc partition itself (for example serial number, or MAC address).

For eMMC devices that is 512 and for UFS devices that is 4096.

-- Brian

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