Legacy Grandstream Firmware
Grandstream phones older than 1.0.7.97 should be able to upgrade to 1.0.7.97.
Point them, via HTTP, to the following URL:
firmware.primevox.net/stable/gs_old/1.0.7.97
Grandstreams that are on 1.0.7.97 must then be upgraded to 1.0.8.56:
Point them, via HTTP, to the following URL:
firmware.primevox.net/stable/gs_old/1.0.8.56
After that, the Provisioning system should push them on to firmware 1.0.9.x
If these firmware steps don't work, purchase a Yealink.
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