Tcu firmware downgrade. K series

[Gundav]

I have a TCU with KT1T firmware, I hooked it to my 2017 F350 HS3 bus, it can be found by Forscan, but Sync 3 can’t get ESN. Looks like the firmware in TCU need to be downgrade to JL3T so that Sync can talk to it, where can I get the JL3T firmware?

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SYNC Region: NA

Navigation Variant: Nav

Manufacturer Year: Pre MY20

Install Type: OEM

Old SYNC Version: 3.2.16280

New SYNC Version: 3.2

Do you have a error message, if so what is it?
none

Update Method: CyanLabs Syn3 Updater

Syn3 Updater Version: n/a

Syn3 Updater Documentation Read: yes

Syn3 Updater Log File

n/a

[warlock12118]

Look at the right column for what you need, update with a good OBD2 like an OBDLink EX takes 45-60 minutes.

[Gundav]

I have the obdlink ex I have updated it to the newest k series firmware . But I only have the k series firmware as an option there. I know I need to change it to the j series but I can’t find a download or way to get the j series files

[warlock12118]

To downgrade you select Custom.
You need a local copy of each of the 3 files

[Gundav]

I know. My question is where to get the three files. I can’t seem to find a place to download them.

[bill32399]

Reach out to @F150Chief

[F150Chief]

I’ll respond today…meetings right now.

[F150Chief]

The latest JX7T files for this TCU are:

See your PM…