Checksum fix online for ECU calibration files
Edited a calibration and the tooling now refuses it? The integrity value stored in the file no longer matches the content. Upload your file here and get it back with that value recalculated automatically, in seconds — the calibration itself is never touched, only the checksum.
Open the tool for your ECU family and upload it. We confirm on screen that your file arrived, with its name and size.
We run the whole job on our server and answer yes or no. If it is no, you are told why — and nothing is ever charged for a file we cannot do.
Only if the answer was yes. You see the price, tick to accept the payment terms, spend your credits and the corrected file downloads on the spot.
Your ECU is not on the list?
To add a family we need one pair of files from the same ECU: one with a wrong checksum, and the same file after it was corrected. Most shops already have both on a laptop. Send them and you use that tool free for a year once it goes live.
Which one is my file?
Most shops know a file by whatever their own software calls it, and every tool uses a different name for the same thing. Here is the translation.
| Four hex characters at the start, then XML and Intel HEX records | Cummins calibration |
| XML with a crc="…" attribute, usually 9–24 MB | Calterm configuration |
| Detroit or Mercedes full read — the family WinOLS calls OLS824 (TEMIC / Conti MCM ACM) | Detroit & Mercedes ACM / MCM |
| Navistar or MaxxForce read — the family WinOLS calls OLS280 (Siemens SID803) | Siemens SID |
Still not sure? Pick the closest one and upload the file there. The format check runs before anything is charged and tells you plainly whether you are in the right place.
Questions about the online service
Yes — that is exactly what this is. You upload the file in your browser, the checksum is recalculated on our server, and the corrected file comes straight back. There is no software to install, no licence and no dongle, so it works from a workshop laptop or a machine that has never had tuning software on it.
Yes. You pick the tool for your ECU family — the table further down this page translates whatever your own software calls the file — and everything after that is automatic: the file is read, every protected block is recalculated, the values are written back and the file is returned. There is nothing to configure and no addresses to enter.
Send the file first. We run the whole job on our server and tell you plainly whether we can do it — yes or no, with the reason if it is no. Only after a yes are you asked to pay, and a file we cannot do is never charged for. What we do not tell you at that point is whether your checksum is right or wrong, or what it should be: that is the answer you are paying for.
You pay per file from a prepaid credit balance, and each tool shows its price before you upload anything. One credit is one dollar. You buy credits by card or PayPal from the credits page in your account, in packs — the bigger packs carry a bonus. Before any payment goes through you tick a box to accept the payment terms, which are shown in full at that moment. There is no subscription, no monthly fee and no minimum, and if a run fails after you have paid, the credits come back to your balance automatically.
No. Files are processed in memory and never written to disk. Nothing is stored, nothing is indexed, and the corrected file exists only in your browser once it comes back.
Working with a file that will not even open — a NavKal .zenc or a Cummins INSITE .eif? Those are the file tools, on the same balance.