Need help upgrading firmware on T22P

[rk0601]

Hello. I recently purchased a Yealink T22P. I am using voip service with Nextiva. I have tried updating to the most recent firmware, 7.72.0.30, from 7.71.0.157.
Every time I run through the update, after a first initialization, it shows that the firmware was updated, but then it goes through a second and third initialization and restores the phone to this software. Any advice on how to proceed would be appreciated.