IMEI number Unknown or corrupt usually happens when the baseband is borked.
<br> Does it also show Baseband Unknown?
<br> Sometimes just flashing the baseband will correct it if you can find a zip file for it.
<br> If not, you may have to flash back to stock to fix it and start over.
<br>
<a href='
https://www.sammobile.com/firmwares/galaxy-s-/SHV-E210L/' target='_blank' class='externalLink' rel='nofollow'>
https://www.sammobile.com/firmwares/galaxy-s-/SHV-E210L/</a>