Hi janch - thank you very much for taking the time to read my posts and trying to help me, I appreciate it :-)
I have downloaded the file and will try to use it tomorrow - I will report back.
I know where the backup I made is stored (I made a new folder for it before taking the backup), however, it does not look to me like a straight copy and paste type of backup - the folders don't look to be in all the same places as they were when they were on the 7700LM internal memory.
Anyway, I am not really wanting to go back to the supplied software if I can help it. I like the way Primo works and would like to run it on this 7700LM.
I tried another unlock that had a folder called Magnetic_S5000 - it had to be renamed 'Default' top work. I will try your fileset in the way you have indicated and only chage the name if required.
UPDATE !
I have now tried the files you sent me. I did have to rename the 'Magnetic_S5000' to 'Default, but it now boots to a selection menu (pics attached) - pressing the 'iGo Primo' button leads to the erro shown in the pic - you will have expected that as you have not given me a folder containing the program yet, I assume :-)
I will wait to hear back from you.
Thanks again, I really appreciate your time and help.
Spoiler: images
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