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Source: Launch / X431 IMMO & ECU Update — August 26, 2026. Launch has shipped a combined IMMO key-programming and ECU software update for the X431 platform, headlined by one-click key programming for Renault and pre-2014 Mercedes-Benz, plus new Simos18.1 engine-ECU boot-mode read/write and cloning on the XPROG5. For locksmiths and ECU specialists, the release moves several all-keys-lost and gateway-locked jobs off the bench and onto a routine OBD workflow.
What the August 2026 IMMO & ECU Update Covers
The release is split across two software lines. The first, IMMO programming software V10.61/V10.70, targets the X431 devices authorized for IMMO work and the dedicated X431 IMMO series tools (IMMO ELITE, IMMO PLUS and IMMO PRO). The second, IMMO PROG V10.26, runs on the XPROG5 and adds the boot-mode and chip-level functions that separate a key programmer from a full ECU tool.
On the IMMO side, Renault V10.61 brings one-click key programming across all supported models and adds an online gateway-unlock function for the Captur II smart-card key and fifteen other models from 2020 onward. That gateway unlock is the headline: modern Renault platforms require the security gateway to be released before a key can be programmed, and doing that online removes a manual step that previously pushed many of these jobs to the dealer. The same update adds OBD all-keys-lost for the Captur II and the Kwid (2022 onward) plus thirteen further models, so a locksmith can generate a working key from an empty slot without pulling modules.
Mercedes-Benz V10.70 adds one-click key programming for all models up to 2014, folding a large block of older FBS-generation cars into a single automated routine. The XPROG5 side is where the release gets more interesting for bench work, and it is covered in more detail below.
Why One-Click and All-Keys-Lost Programming Matter for Locksmiths
All-keys-lost jobs are the highest-stakes work a locksmith takes on. With no working key to read security data from, the technician depends on the tool's ability to talk to the immobilizer, release the gateway where fitted, and write a new key in the correct sequence. Every extra manual step is a chance to brick a module or burn an hour of billable time. Launch's move to one-click routines — combined with the Renault online gateway unlock — collapses those steps into a guided flow, which is the same trend the rest of the auto key programmer market has been chasing.
The Volkswagen and Audi additions follow the same logic. IMMO PROG V10.26 adds VW and Audi MQB-platform 5C/5D immobilizer key programming for vehicles from 2018 onward (Audi 2019 onward), covering a generation of cars whose cluster and key data sit behind more aggressive security. For a shop that already runs an X431 tablet for diagnostics, adding key work on the same Launch X431 hardware means one platform instead of two subscriptions.
ECU Boot-Mode Read/Write and Cloning on the XPROG5
The most technically significant item is Simos18.1 engine-ECU support. IMMO PROG V10.26 adds boot-mode read/write and cloning for the Simos18.1 ECM used across VW, Audi and Porsche engines above 1.8 litres from roughly 2014 to 2018, plus immobilizer-data decryption for the same range. Boot-mode access is the difference between reading a locked ECU and swapping it: it lets a tuner or workshop clone a known-good file into a donor unit, or extract data for repair without a dealer connection.
The same V10.26 build extends chip-level capability to several body and transmission modules. It adds Fiat BCM chip read/write for the Fujitsu MB91F526 and NXP MC9S12XEG384 microcontrollers used in the Argo, Cronos, Toro and Pulse, and Mercedes-Benz VGS2-FDCT transmission-ECU EEPROM data repair for 2015–2017 units. Nissan and Renault HEM/UCH body-module bench reads (R7F7010193, R7F7010253, R7F7010563) now support PIN extraction and module replacement for all-keys-lost situations from 2020 onward. For a specialist doing ECU chip tuning or ECU replacement work, that is a meaningful expansion of what one bench tool can touch.
Compatibility and How to Update
The IMMO software is available to X431 diagnostic devices authorized for IMMO functions and to the X431 IMMO series tools. The ECU and bench functions require the XPROG5 (G5) running IMMO PROG software. As with every Launch release, access is tied to an active subscription: users renew through a subscription card or upgrade directly from the software mall built into the tool. If your renewal has lapsed, the new functions will not appear in the update list until the plan is current.
Before updating, take the usual precautions: confirm the vehicle and module are on the supported list, back up any existing ECU data you can read, and keep the tablet powered and on a stable network during the download. Boot-mode and chip-level operations are not the place to skip a backup step.
Should You Update?
If you do Renault, Mercedes, VW or Audi key work, this release is worth installing the day it reaches your device. The Renault gateway-unlock and all-keys-lost additions alone close jobs that previously went to the dealer, and the one-click Mercedes routine for pre-2014 cars is a genuine time-saver. If your business leans on bench-level ECU work, the Simos18.1 boot-mode and the new Fiat, Mercedes TCU and Nissan/Renault BCM coverage justify the update on their own.
For everyone else, the update is a reminder that the modern car diagnostic tool is judged less by how many codes it reads and more by what it can actually fix — and that the gap between a scan tool and a programming platform keeps closing with every software release.
Written by Roberto Vargas, Key Programming & ECU Specialist at vxdas.com
