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Problem Description

A potential issue can affect the Snom 720 during certain firmware downgrade: after the downgrade start the phone stuck without ending the procedure. Is still possible to recover the device performing a TFTP recovery.

Solution

In order to address this issue we re-released some 8.7.3 firmware builds.

The re-released 8.7.3.x FW images are identical to ones they supersede, they are just smaller in file size by a removal of redundant files, so the build itself remains unchanged.

If you are locally hosting the Snom 720 firmware images please make sure to update your 8.7.3 fw binaries to the new re-release.

Re-Released binaries:

Version	URL	MD5 Checksum
8.7.3.25.9	http://downloads.snom.com/fw/snom720-8.7.3.25.9-SIP-r.bin	af4fa2300dc47561ba6b8d0344382529
8.7.3.25.5	http://downloads.snom.com/fw/snom720-8.7.3.25.5-SIP-r.bin	2dfe075363be789d8bea13f043ff10bb
8.7.3.25	http://downloads.snom.com/fw/snom720-8.7.3.25-SIP-r.bin	bd9c78a82bd3c5c89ba66203c5040f8a
8.7.3.19	http://downloads.snom.com/fw/snom720-8.7.3.19-SIP-r.bin	59c869f2ca7fc32aaf7ce13d2c3f38ee
8.7.3.15	http://downloads.snom.com/fw/snom720-8.7.3.15-SIP-r.bin	49ffc839935e39dcba2747c2e660b1be
8.7.3.10	http://downloads.snom.com/fw/snom720-8.7.3.10-SIP-r.bin	f0600401e44a83292b72f946dfc5c1f9
8.7.3.7	http://downloads.snom.com/fw/snom720-8.7.3.7-SIP-r.bin	21a0b96122f36bd6eeacae1eb87d0949

FAQ

Q: I already did the downgrade and now my phone is not usable, what should I do?
A: You can recover the device following the TFTP recovery procedure.

Q: How can I verify if my PBX is providing the the "new" binary or the old one?
A: You should verify the MD5 checksum of the file, on Windows operating system you can use the FCIV utility, on Linux or Mac/OSX you can check the MD5 hash using the md5sum command.