It can be its possible to convert .img to .tar on follow NOT TESTED way::skull:

:skull:Attation: NOT TESTED !!!:skull: NOT RECOMMENT !!!:skull:
1 - Download and install 7-zip Download
2 - Download the latest .img file
3 - Open a file explorer, rename the downloaded file to: recovery.img
4 - Right click on the file > 7-zip > Add to archive…
5 - In this screen you can change the file name and, most important, in “Archive format” choose “tar”
6 - Flash the .tar file
:skull:Attation: NOT TESTED !!!:skull: NOT RECOMMENT !!!:skull: