Dwanthny and kartu,
Thank you both for the prompt replies.
Especially kartu for the link - it seems every time I come to this or related forums a new source of information pops out. I swear I'd looked for stuff like this before posting! As I indicated, my sequence of events that lead to bricking and then unbricking (aside: anyone remember a 1969 LP by Fairport Convention 'Unhalfbricking'?) were not well documented or remembered by me (doh!) so I don't believe I have relevant firmware backups. No-one's fault but mine for that.
My 505 gives every appearance of being fully functional as a 1.1.00.18040 device. My enquiry was more driven by curiosity about UK 1.2 firmware. Since getting the 1.1 firmware loaded I have tried PRSCustomiser a couple of times to make minor changes successfully. However I do seem to consistently fail when trying to load new fonts, but I've established a recovery routine there. I'll continue experimenting, but my ambition and expectations in this direction are already very much reduced as a result of my earlier mishaps.
Thanks again for the replies.
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