The management of the building where I work bought two refurbished Mitel 5324 phones to replace two damaged Mitel 5324 phones. The PBX is an old Mitel 3300 ICP that was installed about 15 years ago by one of my predecessors who no longer works there. For a bit more context, I work for a company that rents space in the building and provides technical support "on the side" to the management of the building. I don't have any training on Mitel PBXs, so forgive me if I sound like a complete novice.
I have deleted and recreated the extension of one of the "old" Mitel 5324 phones and added the mac address of one of the "new" Mitel 5324 phones, but it always gives me an "L2 DL Error" after trying to download something called "main" from tftp.
As recommended on this forum, I tried pressing the # key during boot to get into the special configuration menu. I did several tests, tried adding the network parameters manually, tried changing the phone mode from mitnet to sip, but nothing worked. Ping test to the PBX worked fine. DHCP trace returned the parameters set on option 125. Finally, I tried deleting "main" on the phone, but it gives the same error, and the special configuration menu is now inaccessible. I also tried logging into the tftp server on the PBX with filezilla and it worked.
Since none of the above worked, I'm guessing that the problem is related to the firmware version of the "new" phones being much more recent than that of the "old" phones.
Below are the versions I was able to extract from the two different phones.
Mitel 5324 "Old"
Main 02.00.02.07
Boot 02.00.02.07
L2Boot 02.00.00.31
DSP 2.1.0.3
Mitel 5324 "New"
Main 06.05.00.11
Boot 06.04.01.02
L2Boot: 06.01.00.09
DSP 3.0.0.21
From what I can gather from the posts on this forum, I either need to downgrade the firmware on the "new" phones or upgrade the PBX so that I can then upgrade the "old" phones to the same version as the "new" phones, but to be honest I don't know how to do that or if it is even possible, and the PBX documentation is unhelpful.
1) What is "MOL" and where or how do I download the upgrade .exe?
2) How do I know what version the PBX is on and if it's possible to upgrade it?
3) Is it possible to downgrade the "new" phones? <- this would be preferable
4) If it's not possible to downgrade, how do I upgrade the PBX and the "old" phones?