GL-E750 C4 Mudi batter not chargng

Router battery stopped charging, at the least the battery signal doest change from showing X when plugged in or not. It’s not the cable as I have two routers and the cable works with the other one. I’ve tried rebooting and resetting the router but it didn’t help. Any idea what could be done?

Can you try reset MCU? It’s in the small hole next to the SIM card

Thank you for replying, I’ve tried reseting MCU, it didn’t help, but once the battery drained, it turned on with the battery charging, so issue is solved