I also had this kind of purple glow during messing around with the router for first time ...
I did the following to fix don't know if it will work for your router ( my routers manufacture date was in 2020-11)
Remove the plug from your router
Hold the reset button while the adapter is removed
Keep holding
Then Attach the adapter again ( still hold )
Then it will flash fast yellow ( safe mode with tftp is enabled at this stage )
Drop your image using tftp server it will accept and flash yellow for 10 M then turn blue
Then reboot and go to router.miwifi.com and change the settings
Some references: