Please PM me your email and I'll send the 18 MB package to you.
I manage to 'save' the device with this. But it's not a piece of cake. It really seemed simple: copy some files at the root of a usb disk, and boot the device with the key plugged in.
For the record, here's how it went:
(i almost never use USB keys, so i dont have a bunch of them)
Failure #1: using my usual usb key, the one that i've used to update almost everything here, including siglent devices such as SDS 1104x-e or SDG 1032x: nothing happened (noname, 4Gb, 'linux' partition id, vfat).
Failure #2: using another key (noname, 8G, 'w95 fat32', vfat)
Failure #3: wanting to 'start from scratch', I repartitionned/reformated a key, similar to the one used in 1 (noname, 4G, 'linux', vfat)
Failure #4,5,6: didn't take note :/ But none was 16G (doc says it's not supported). I tried some fat, fat32, ntfs. Didn't try 'exfat'.
Success : another key (noname, 4G, 'w95 fat32', vfat)
Failure means: nothing happened, even after ~5minutes, The doc says it can last ~2minutes. All keys were using 'dos' partitionning, not mpt. This has a field 'partition type', and this is what i display in 'partition id'. No idea if that's relevant or not. I could not figure out what the last one has that others dont... It's a very old key i hadn't touched for years.
On success, it was obvious right at start that something was happenning. The key led blinked (other keys didn't have leds, so can't say), the device screen blinked once or twice, and i had the GUI after only one minute.
Interesting checks right after this:
* the firmware was, as expected, back to a very old version 1.01.01.22R5
* the hack was still valid (30->60MHz), so I really doubt this was the original problem
* the 'startup times' displayed in 'system info' was reset
I finally managed to update to 1.01.01.33R1B5. Once again, the 'hack' survived. I noticed that the hardware version was changed from 02-01-00-23-00 to 02-01-00-24-00, which is .... interesting for a firmware update. I didn't notice if this was this way with 22R5, but probably not.
Anyway, thanks a lot to tautech. NZ is almost as far as possible from here (France), but I wish I had such a reseller here in Europe.