BMW M5 Stage 1 ECU file 1303C20_ZCCA5900_8HPTU_BMW_CC590 BMW_8HPTU_AT50020_CC590A_M1

Software number different? Send the original file read with your own KESS, Autotuner or Flex. We transfer this Stage 1 onto your dump. Digital product — no refund after payment.

This page is a modified Stage 1 ECU file for the BMW M5 4.4 V8 Bi-Turbo 602hp running ZF 8HP75Z. It is a professional remap — not a stock original flash and not a full ECU backup.

Match hardware BMW_8HPTU_AT50020_CC590A_M1 and software 1303C20_ZCCA5900_8HPTU_BMW_CC590 before you write. If your sticker shows a different software number, do not force this file: send us your original read and we will transfer the Stage 1 changes onto it.

We can transfer this Stage 1 onto your original file

If your ECU is not on this exact software number, send us the original file read with your own tool (KESS, KTAG, Autotuner, Flex, PCMFlash, and similar). We will transfer the Stage 1 modifications onto that dump and return the modified file. Do not send a file that is already tuned unless you say so.

What this BMW M5 Stage 1 file is

It is a daily-driver calibration for professional tuners and ECU workshops. Keep a known original on the bench before writing. A complete ECU image for cloning or brick recovery is a full backup — sold separately on request for €20. ECU flash repair after a failed write is €50.

Full backups and ECU flash repairs

• Full ECU backup (complete image for clone or recovery): €20 on request — this modified listing is a Stage 1 calibration — it is not a full ECU backup.
• ECU flash repair after a failed write or brick: €50 — contact support with HW/SW and the tool you use.

Professional use only

These files are intended for professional tuners, ECU specialists and workshops. You must understand flashing, checksums, boot/bench recovery and the risk of a no-start. We do not sell this as a DIY kit for untrained use.

Digital product — no refund after payment

This is a digital file delivered after payment. Once it is paid we cannot refund, reverse or take back the download. Check hardware and software numbers on the ECU sticker before you buy.

FAQ — BMW M5 Stage 1

My software number is different. Can you still help?

Yes. Send the original file read with your own tool. We transfer this Stage 1 onto your dump and send the modified file back. Say which tool you used (KESS, Autotuner, Flex, and similar).

Is this a full ECU backup?

No. This BMW M5 page is a Stage 1 calibration only. A full backup is €20 on request.

Who can use this file?

Professional tuners, ECU specialists and workshops. Check HW/SW on the ECU before payment. This is a digital product and cannot be refunded once paid.

What if the write fails?

ECU flash repair / recovery is €50. Contact support with hardware BMW_8HPTU_AT50020_CC590A_M1, software 1303C20_ZCCA5900_8HPTU_BMW_CC590, and the tool you use.