I have a UC520 with 8.0 version installed, after de upgrade to 8.0 the phones don't upgrade the firmware, it starts the upgrade but immediately gives a "Auth Fail" in the screen, proceeding with the boot.
I haven't configured anything on phone security...
I welcome any help.
You will need to go under your flash and install the 8.5.2 firmware for that type of phone
So take backup of the 8.5.3 firmware and the lines in your config for 8.5.3
Then you will need to issue
tftp-server flash:/phones/7941_7961/apps41.8-5-2TH1-9.sbn alias apps41.8-5-2TH1-9.sbn
tftp-server flash:/phones/7941_7961/cnu41.8-5-2TH1-9.sbn alias cnu41.8-5-2TH1-9.sbn
tftp-server flash:/phones/7941_7961/cvm41sccp.8-5-2TH1-9.sbn alias cvm41sccp.8-5-2TH1-9.sbn
tftp-server flash:/phones/7941_7961/dsp41.8-5-2TH1-9.sbn alias dsp41.8-5-2TH1-9.sbn
tftp-server flash:/phones/7941_7961/jar41sccp.8-5-2TH1-9.sbn alias jar41sccp.8-5-2TH1-9.sbn
tftp-server flash:/phones/7941_7961/SCCP41.8-5-2S.loads alias SCCP41.8-5-2S.loads
tftp-server flash:/phones/7941_7961/term41.default.loads alias term41.default.loads
tftp-server flash:/phones/7941_7961/term61.default.loads alias term61.default.loads
ofcource have to no the old lines out which point towards the newer 8.5.3 firmware.
then you need to go to telephony-services
and do the loads
load 7960-7940 P00308010200
load 7941 SCCP41.8-5-2S
load 7941GE SCCP41.8-5-2S
load 7961 SCCP41.8-5-2S
load 7961GE SCCP41.8-5-2S
load 7970 SCCP70.8-5-2S
load 7971 SCCP70.8-5-2S
load 521G-524G cp524g-8-1-17
Reset the phone and they should program to 8.5.2
then move the old files back and restore the old config.
That will flash the phone to the 8.5.3 version which comes with 8.0
Hope this help
Hafthor Hilmarsson CCIE - Voice #24527
What kind of phones? What firmware version are you upgrading them from and to?
If you are trying to go to SCCP 8.5.3 I think you need to be at 8.5.1 or 8.5.2 first or you will get this error because of new signed firmware versions.