When the W202/W204/W207 ESL damaged, you will need to use the VVDI MB NEC ELV adapter to work together with VVDI MB BGA tool to renew, then use MB BGA tool to reprogram key.
XHORSE VVDI MB NEC ELV Adapter
When you will need use this ELV Adapter?
Unlock W204 ESL: Fix the locked ESL to normal one (NEC chip fatal error: 0xAA). This function need buy an extra NEC ELV adapter, support W204 ESL and old Motorola ESL. You need select Adapter option in ESL window
1pc x VVDI MB NEC ELV adapter
How to use NEC ELV adapter and NEC Key adapter for VVDI Benz BGA