Generally with CEC problems first step always is to disconnect both devices from power (physical unplug) for 1 minute and then reconenct.
Also for your specific issue check in the CEC settings if anything might have been reset during the upgrade.
Generally with CEC problems first step always is to disconnect both devices from power (physical unplug) for 1 minute and then reconenct.
Also for your specific issue check in the CEC settings if anything might have been reset during the upgrade.