KM5221W - Dell Universal Receiver Needs Reflash (FW) after "accomplished" update in Dell Peripheral Manager.

It was time for update cycle, so i started updating everything as usual.

After updating entire computer, it was time for peripherals.

Using Dell Peripheral Manager app, i updated mouse & keyboard, then... it went unresponsive.

Under devmgmt.msc it's calling back as nRF24LU1P-F32 BOOT LDR.

I've read it happened few times for Logitech Unifying, and fix was as simple as reflash under Linux.

The case is... i can't find firmware anywhere.

Anyone willing to help? :D