Factory reset S500 phone

I have an S500 that has been running on my Grandstream PBX for a while. I unplugged it for a day, and then when I plug it back in, it’s going through self checks and trying to register, but it seems like it’s stuck in a zero-config loop. It never finishes booting. So the question here is can I do a power-up factory reset somehow? All the documentation I see shows how to do it from a functioning screen. Any thoughts?


I got it. It was a race against the clock. Once I found the IP address, it was a matter of logging in at just the right moment and deleting the server path info in the auto provision screen. After that, It booted and now I can play.

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