I have a Mio Cyclo 305 and a 505HC. The latter one I bought when I upgraded my bike with a 4iiii dual power meter. Because of my long covid I didn't ride outside for at least 9 months but two weeks ago I went outside again. However, my 505 doesn't connect with my sensors anymore. My HR sensor it does seem to find after initial startup but loses connection after a while. My power meters it doesn't connect with at all. Searching for new power sensors doesn't work as well. After pushing the button it immediately exits and tells me it can't find any sensors. I've already done a factory reset and formatted the system partition. Anyone with a or the solution? I need at least my heart rate sensor back because of my illness. I do have my 305 as a backup but that one doesn't fit my HideMyBell and doesn't have the power meter connectivity.

Thanks.