Thank you very much. It´s a one shoot solution!!! I'll try in next update.I tried it with Poco f4 gt.
X-plore file manager makes it very simple.
I copied it from last week's dev to the latest weekly.
First I opened the new zip. (it should not be unpacked)
X-plore file manager and many similar two-window file managers allow you to delete modem.img from the images folder.
Then, in the other window, I accessed modem.img in last week's dev in the same way.
I simply moved/copied this to the new images folder.
The file manager does not modify it, just copy from the folder to the folder.
Ready. Then I tried it with TWRP. Success.
The same procedure from Global /EEA
I also tried it with Poco f5 pro. Managed!
Thanks for pictures too and software to use.