There are no restrictions on using stock firmware version 1.0.49 to recover 1.0.31 RD31 device - feel free to try.
While it was previously reported by 1 (or 2?) users that AX3000T 1.0.31 RD23 rejected to accept 1.0.49 firmware via the MiWiFi restore tool or the TFTP method, 99% of other users successfully completed the process.
Just make sure properly follow instructions and disable firewall
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