Quick update: got video recording fixed thanks to mal at #sailfishos-porters.

Currently I switched to SailfishOS 2.1.0.11 and there is no browser scaling issue anymore, everything else seems to work more or less the same. The main issue is Bluetooth now.

Unfortunately I'm still unable to contact sledges to add device to OBS, which is required for OTA updates. I'm waiting for this to make new image, otherwise reflashing is needed.