SW38 Lock50 HW04 Allows Downgrade RFA Module Software OBD when its High

SW38 Lock50 HW04-B or C  Allows Downgrade RFA Module Software OBD when its High

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SW38 Lock50 HW04-B or C Allows Downgrade RFA Module Software OB
Lock50 SW38 — Downgrade the RFA software over OBD when it is too high — HW04-B or C
When a new RFA has higher software than the current GWM and BCM support, downgrade the RFA over OBD instead of upgrading the other modules first — add the keys, then take everything to the level you want • JLR
🔧 RFA software downgrade over OBDNo BCM / GWM upgrade firstHW04-B or C

What SW38 does

  • When you fit a new RFA with higher software than the current GWM and BCM support, it is safer to downgrade the RFA than to upgrade the BCM (and GWM) first just to add keys.

How to do it

  1. Go to Special Functions → RFA Downgrade.
  2. Go back to the RFA in the module list — it now updates fine and accepts keys.
  3. After adding the keys you can upgrade the GWM, BCM and RFA to the highest software, or leave them on the older levels.
Downgrading the RFA avoids upgrading the BCM and GWM before you can add keys — less work and less risk.

Hardware and packages

  • Runs on HW04-B or HW04-C over OBD.

Related Lock50 functions

Function What it does & when you need it
SW27 New RFA programming with an unlocked BCM — 2017 to 2024.
SW28 New RFA programming with a locked BCM (R8E2 / M8E2) — 2017 to 2024.
Official Lock50 Master Token Pricing & Systems Protocol
Check HW04 package tier inclusions (PAYG, A, B, C, C+), token rules, and module guides. Adding keys to unlocked modules is always 100% FREE.