Procedure to program BMW EWS4 key with xhorse vvdi key tool and EWS4 adapter:
1). Read eeprom.
2). Make dealer key (pcf7935 or Universal xhorse xt27a super chip transponder generated as vw id33),
Don’t write file back to EWS!!! This system no need to write back.
Put everything back, start the car. Job done.
Tips to install the Xhorse EWS4 adapter with key tool plus:
Xhorse adapters for reading dumps are quite reliable if you know how to use them.
Before installing the EWS4 adapter, the contacts should be cleaned several times.
After installing the adapter, you need to read the dump 2–3 times and save it after each read.
Then you compare all the dumps you have read (Xhorse Key Tool Plus has this feature).
If they are identical, you can proceed to create a dealer key and write the generated file back to the EWS.
If you read the dump with errors — which often happens when reading via adapters — and then create a dealer key and write the new dump back, that can permanently damage the EWS.
There are two ways to connect the Xhorse EWS4 adapter with key tool plus:
Way 1: Connect Key Tool Plus with EWS4 adapter via multi-funtion converter.
Way 2:
Connect key tool plus with EWS4 adapter via XDNP14 DB15-DB25 EWS4 adapter.
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Alternative approach:
The cheapest and most reliable way is often to source a complete EWS and DME from the same vehicle (for example, from a junkyard), install them together, and program new keys.
This avoids the risks of bit errors, incorrect dumps, and complex synchronization with existing modules.
Once installed, the new EWS, DME, and keys will work seamlessly together, resolving the problem without the need to restore corrupted dumps.
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