SIM Card Issue after downgrading from PIE 9.0

[marstonpear]

1)https://en.miui.com/download-354.html -> stable rom download
2) fastboot oem edl
3) Extract stable rom
4) image folder in rawprogram0.xml file modify (dummy.img add)
<program SECTOR_SIZE_IN_BYTES="512" file_sector_offset="0" filename="dummy.img" label="modemst1" num_partition_sectors="16384" physical_partition_number="0" size_in_KB="8192.0" sparse="false" start_byte_hex="0x27ff400" start_sector="81914"/>
<program SECTOR_SIZE_IN_BYTES="512" file_sector_offset="0" filename="dummy.img" label="modemst2" num_partition_sectors="16384" physical_partition_number="0" size_in_KB="8192.0" sparse="false" start_byte_hex="0x2fff400" start_sector="98298"/>
5) by using xaomiflash flash

good luck.

I've done what you say, now my phone's mobile connection is lost, even after flashing the stock ROM with MiFlash several times. Thanks, I guess. lol

 

[Gumka1977]

I've done what you say, now my phone's mobile connection is lost, even after flashing the stock ROM with MiFlash several times. Thanks, I guess. lol

When you flashing Pie pas the point 4. !! That's manual is probably for downgrading to Oreo.

 

[marstonpear]

When you flashing Pie pas the points 3. and 4. !! That's manual is for downgrading to Oreo.

I downgraded using your method, then I lost mobile connection on Oreo. So I downloaded stock Pie from Xiaomi and flashed it, problem was still there, even after I flashed stock via MiFlash and skipped 3-4 (obviously). This method you wrote, seriously f***s up some stuff. So yeah, I'd suggest people to stay away from it. I could barely fix it in an hour.

 

[Gumka1977]

I downgraded using your method, then I lost mobile connection on Oreo. So I downloaded stock Pie from Xiaomi and flashed it, problem was still there, even after I flashed stock via MiFlash and skipped 3-4 (obviously). This method you wrote, seriously f***s up some stuff. So yeah, I'd suggest people to stay away from it. I could barely fix it in an hour.

This is not my method mate !! Read carefully.

 

[DonRober]

Thanks to Eremitein, all sim problems solved and something more https://forum.xda-developers.com/mi-a2-lite/how-to/gsi-tweaks-fix-t3899630

Do you know how the script works? Does it flash the modem partition or just applies the code to the phone?

If I don't use a second sim, is there any other reason to apply a fix?

 

[RFMC]

This is not my method mate !! Read carefully.

What a mess...
O understood that the "persist.img" & "dummy.img" process was for the Oreo 8.1 stock rom, after the downgrade.
And nothing changed. Still have swapped SIM slots.
But actually this is not a problem. Even with swapped
SIM slots everything works fine, both SIM and both voice and data.
Meaning that the swapped SIM slots downgrade problem is not the same for everybody, neither the solutions...