Want to go back to firmware 1.8 but can't

Hi!

I installed firmware 1.9 on my tracker and see a lot of weird behaviour.
I want to crosscheck with 1.8 .

But when I try to update the firmware to 1.8 (which I still had on my laptop, backed up), I get the message ‘Update failed’.

How can I go back to 1.8 ?

just checked mine, downgraded no issues, all working fine again 1.8

Thanks for checking!

I found another backup of mine and tried again.
Now it does work!

Seems that the first backup firmware is corrupt.