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Similar to https://www.3cx.com/community/threads/3cx-wants-old-firmware-for-t57w.88300/ we have a client with a relatively new phone from last fall where 3CX shows it as an even later version:

3CX wants to "upgrade" to "96.86.0.63 Yealink T57W FW: Maintenance release" but if I try, it doesn't downgrade. It's been a while so I don't recall if it does nothing, or does reboot but stays on the higher version.
It's working fine, so I was waiting for 3CX to "catch up" the version. But the above thread sounds like Yealink went backwards in their numbering? If so, way to go Yealink. Should we be manually installing the 96.x firmware on it? If so where is a download for .18 or .63? As noted in that other thread https://www.3cx.com/sip-phones/yealink-t5-series/ has the 97.x firmware linked.
/var/lib/3cxpbx/Instance1/Data/Http/Interface/provisioning/*/firmware/ and firmware_new have the same four files:
-rw-r--r-- 1 phonesystem phonesystem 42373888 Nov 19 08:14 'T54W(T57W,T53W,T53,T53C,T54,T57)-96.86.0.23.rom'
-rw-r--r-- 1 phonesystem phonesystem 43069216 Nov 19 08:14 T5XW-96.86.0.45.rom
-rw-r--r-- 1 phonesystem phonesystem 43078560 Feb 22 12:14 T5XW-96.86.0.63.rom
-rw-r--r-- 1 phonesystem phonesystem 347008 Aug 16 2021 'patchT54W(T57W,T53W,T53,T53C,T54,T57)-96.86.0.23.rom'
I tried guessing the download URL from the client's 3CX server and got a blank page.
Thanks,
3CX wants to "upgrade" to "96.86.0.63 Yealink T57W FW: Maintenance release" but if I try, it doesn't downgrade. It's been a while so I don't recall if it does nothing, or does reboot but stays on the higher version.
It's working fine, so I was waiting for 3CX to "catch up" the version. But the above thread sounds like Yealink went backwards in their numbering? If so, way to go Yealink. Should we be manually installing the 96.x firmware on it? If so where is a download for .18 or .63? As noted in that other thread https://www.3cx.com/sip-phones/yealink-t5-series/ has the 97.x firmware linked.
/var/lib/3cxpbx/Instance1/Data/Http/Interface/provisioning/*/firmware/ and firmware_new have the same four files:
-rw-r--r-- 1 phonesystem phonesystem 42373888 Nov 19 08:14 'T54W(T57W,T53W,T53,T53C,T54,T57)-96.86.0.23.rom'
-rw-r--r-- 1 phonesystem phonesystem 43069216 Nov 19 08:14 T5XW-96.86.0.45.rom
-rw-r--r-- 1 phonesystem phonesystem 43078560 Feb 22 12:14 T5XW-96.86.0.63.rom
-rw-r--r-- 1 phonesystem phonesystem 347008 Aug 16 2021 'patchT54W(T57W,T53W,T53,T53C,T54,T57)-96.86.0.23.rom'
I tried guessing the download URL from the client's 3CX server and got a blank page.
Thanks,