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Connect device in fastboot
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Open command prompt
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Type: fastboot getvar all
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Hit enter
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Check the lines with slot_unbootable
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If it says "yes" then you need to fix it
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Example-
(bootloader) slot-successful:_a: yes
(bootloader) slot-successful:_b: no
(bootloader) slot-unbootable:_a: no
(bootloader) slot-unbootable:_b: yes
- Download tiny fastboot script from lolinet- https://mirrors.lolinet.com/software/windows/TinyFastbootScript/
- Your device firmware(one version older than the one you wish to be on) from- https://mirrors.lolinet.com/firmware/lenomola/
- Brain
- Eyes
- Extract both TFS and firmware in the same folder
- Run flash.bat
- Use the default bootloader version(1st option)
- Press 5 to flash full firmware and factory reset
- Wait
- Boot your phone in system once flashing is completed
- Go to updates in settings
- Do an OTA and reboot
Now your slots are fixed. You can flash custom rom without any issues.
Credits- Me, Lolinet guys and our hardworking devs.