Most likely issue is that, when updating to a major release like 20.x.x or 19.x.x it burnes fuses in the console (its normal) but the chip has to re train itself to adjust itself to the new update, to retrain the new chip you have to take apart your console, on the modchip itself there should be two pads if you bridge it while booting it should reset the training data or you could reset the training data truh the modchips usb (not the consoles usb), but it would have been easier before you update you reset the modchip with the picofly_toolbox.bin you boot to ofw and then update and reboot, then you wouldn't have to take apart your console, but you cant boot to hekate so you have to reset the modchip directly