so after spending all day online researching into checksums i think my mind is burnt out .

From chatting with a friend who is also interested in this ecu he seems to think there could be up to 32 checksums in the file , could this be true ?
I have also read in a few places that the galletto will correct the checksums upon uploading (i find this somewhat hard to believe )

for now now im stuck , i really hope i don't end of being beaten by this

i have been reading stuff on here all day and keep flicking back and forth to winols ,to see if i can relate to anything

Andy Whittaker's site is another that i have been reading all day (fantastic information on there), i think the general idea of the checksums is starting to go in however im really struggling to find them in the hex .
i would be fine with a disabled checksum if i knew how to do that , ill keep searching but i honestly feel beaten already on such a complex subject

Sorry, but the checksum points from EVC refer to their payment plan for the plugins, not the amount of checksums in a file.
You can buy checksum points (like credits) and spend them on plugins as you like.
2 CS points equals ca. 300 Euro, if I remember correctly.

Well, the price for WinOLS and plugins etc. is clearly aimed at professional users.

If you want to just tune your own car, get the demo and try to learn with that.
Powerful features like connecting two dump windows/compare function are also available in the demo, so you just need to figure out a way so safe your files. Some people copy and paste changes into a hexviewer. Another way would be to use the demo just for finding/comparing maps and do the rest in Tunerpro or similiar software. Depends on your taste and what you find convenient to work with.

ME1.5.5 can be read and flashed with most major OBD-2 tools. (And even with cheap copies of them. Although I don't use clones and have no exp. with them)
Most tools will do the checksums automatically during the write process or offer a checksum correction function, so I think you're better off with a decent tool before buying WinOLS+plugins.

Good luck!

so the ultima checksum calc seems to work pretty well on all the files i have ,
seemingly the galletto clone i have does change the checksums to be correct although i still dont trust .
i messed with a file a little , loaded it onto yet another spare ecu , then downloaded it with the sum corrected ,
i then ran the same file through ulitma and it corrected 3 checksums .
i then compared the two files in the hex editor and both came back bang on the same . the car started fine and all seems well

my next challenge is to try and recover my first bricked ecu (prob poor connection or voltage) and then i may actually be able to get this thread on track .

so far the pointers i have had on here have been a massive help - feel free to correct me if im off / getting over confident with anything as i still consider myself a noob

10hrs solid logged in , bedtime i think

looking at th wiring on thi thing it looks like the immo transponder is located on the k line inbetween the ecu and obd port.
im taking that means the right transponder and chip has to b present even  on the bench flash setup , again im likely to be wrong on this again as im just making an educated guess.

i really cannot find any info on putting the me 1.5.5 into boot mode and as the ecu is of hybrid type i dont think grounding any of the chip legs would be possible( they ar tiny)
ill try not to be put off by this too much . more ecu's heading  my way now , will they be bricked as well who knows ........

Hello Danoob,

Could you repost that z20let xdf file?
It seems to be removed from your link.

Thanks