Need to downgrade framework to proceed with upgrade

I upgraded php to 7.4 in a preparation to FreePBX 16 upgrade and that broke my FreePBX (15) GUI.
Then I decided to upgrade to 16 immediately but faced a php bug and upgraded my framework as suggested here Implode(): Passing glue string after array is deprecated. Swap the parameters
Now I cannot proceed with 15->16 upgrade because of the wrong framework installed. Please advise how to recover from this situation.

fwconsole ma downgrade <module name> ?

Unfortunately my attempts to downgrade Framework broke the installation, I decided to reinstall FreePBX 16.

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