Sorry, I forgot to tell the whole story because I was in a hurry to ask for help...
I'm going to collect some other binary files from my own hardware and put them on the great free OS binaries page which you all should know (check my latest post there).
Then, I don't own an EPROM burner but I found someone who's gonna "borrow" me one for a few days only (that's the reason of my hurry).
Now, the whole blah blah story.
I checked inside all of the devices of my musical collection, and I discovered that my
version 1.1 MPX 1 has its EPROM
directly soldered on the main board, instead of being put on a socket; this is very strange, because the v1.1 upgrade from Lexicon was originally available as a chip replacement kit (for a confirmation, please browse the web for the upgrade instructions on PDF), so one would expect to find a socketed chip to extract... Not in my case.
Therefore I asked if somebody has the v1.1 binary ready, otherwise my only way to back it up would be desoldering the EPROM (gulp!) for reading it, hoping that I won't do any damage to the chip. I'm not a superskilled electronical repairer; I just know how to extract a scketed chip and put it back, and I don't like the idea of trashing my MPX 1 in an attempt to taking care of its firmware for the future...
I hope it is clearer now. Thanks for your attention and trust
Claudio Falcone
(lead vocalist for Alphataurus prog-rock band)
[EDIT] - I just sent this first batch of firmware binaries to dbwbp.com:
Alesis QSR v1.02
Evolution EVS1 v1.4 (OS & sample ROM)
JLCooper MSB Plus Rev2 v2.01
Korg 707 - 870904
Korg Prophecy v1.7 (not the latest version, I know)
RFX MP1288 MIDIWizard pedalboard
RFX RP93s Patchwork MIDI-controlled audio switcher
Waldorf Midi Bay MB-15 v1.0
Yamaha MU100-R (two versions)