Do not touch the unit until the front display reads . The receiver will automatically shut off or prompt you to reboot. 🌐 Alternative: Update via Network
While the 2021 firmware fixed many problems, it introduced two minor quirks (which Onkyo never patched because support ended): txnr646 firmware update 2021
You can check your current version by pressing on the remote → going to Setup → Miscellaneous → Firmware Update → Version . Do not touch the unit until the front display reads