Ensure that the target firmware is not the same as the current firmware.
Ensure that the target firmware is applicable to the IP phone model.
Ensure that the power is on and the network is available in the process of upgrading.
Ensure that the web browser is not closed or refreshed when upgrading firmware via web user interface.
For more information, please refer to Administrator Guide or the corresponding user manual.
Product type: SP-R50(P) ,SP-R52(P), SP-R53(P) and SP-R59(P)