This was the answer Doug Piston gave to someone who was having problems similar to me. Should I try to add the file and leave out the .zip.
Originally Posted by Weezy Jefferson
hi everyone,
i am trying to unroot my droid incredible.
i have downloaded "PM31IMG.ZIP" and tried to extract this compressed folder. no matter how many times i have downloaded this from various sites, it continues to give me "the compressed (zipped) folder is invalid or corrupted." it will not unzip / extract.
any ideas why this wont extract? does anyone have an extractable version of pm31img?
any assistance and insight is much appreciated.
thank you in advance.
Backup your sd card and format it to fat32 Then try you PB31IMG.zip. If you are on windows just rename it to PB31IMG and leave of thee .zip and it will be done for you.