When trying to modify the clients device type via the android app v2.6.1 I receive "status code: 500"
To replicate you just need to choose a new icon and click save and you will receive the error.
Device: Brume 2
Firmware: 4.7.0
I can confirm that if I edit the device type on the 4.7.0 firmware directly via the web GUI then the changes are replicated to the android app, it just seems that android app can't communicate to change the icons correctly.