Sonoff Basic Wi Fi Switches Current Software Reload

My collection of operational Switches includes BASIC and BASIC2. In the collection I have noticed that just one of the switches a BASIC2 with firmware ver 3.7.6 will not power up in ON mode despite the Power On State selected as ‘ON’.
Because it is the only switch affected I suspect that its firmware is corrupted. I’m wondering if anyone knows if there is a way of reloading the latest version of firmware into the device.

Thanks

I’ve never seen a way to do it yourself but I think maybe @sonoff can push beta firmware to devices so maybe they can also push stock firmware too…