Factory Firmware Revert - Linksys MR series

Installing and Using OpenWrt
1

Attempting to revert back to factory Linksys .img.
Luci not installed so going through ssh
Nav to /tmp
wget .img file from Linksys
Run sysupgrade -F -n -v '.img'
Router does not come back up

If I do the 3 power-cycle fallback to other boot partition, I get back into OpenWrt
Any ideas where I'm going wrong?

Looking to put this back to factory to give to a family member, then buying myself a new router for OpenWrt

2

Update, now (I haven't touched anything since this post I swear) I cannot get into OpenWrt via 3 power-cycle fallback method. So strange!

3

Sorry, were not familiar with any router model called MR.

4

That would be the MR series (MR7350 for example)