NR5103E firmware again

I just bought a used NR5103E. Since updated firmware is generally a good practice the first thing I did was to update it, but I did not pay attention to the important "E" in the end. Loading the NR5103 firmware into the NR5103E hardware resulted in a malfunctioning unit. It's not bricked, I can still access the web-interface and I do have a working LTE/5G connection.
The problem should be easily solved if I could just get my hands on any of the NR5103E firmware binaries. But after an hour with Google I have not had any success. This firmware seems impossible to find. Anyone out there with a copy to share?