You can’t jump from what firmware version you are currently running directly to the firmware with Ignition 8 in it.
Go back to your manage.groov.com portal and download the 3.1.0 version with Ignition 7 in it.
Update to this version first.
Then update to the version with Ignition 8 in it.
Note: You should only update to Ignition 8 if you really must run 8. Just update to 7 if you don’t actually need either Ignition or Ignition 8.
FYI, the error; fail to decompress, is because Ignition 8 is about twice the size of 7 and the EPIC needs to run the Ignition 7 update first to make room on the EPIC for a possible future update to the version with Ignition 8 in it.