When the W202/W204/W207 ESL damaged, you use VVDI MB NEC ELV adapter to work together VVDI MB BGA tool to renew, then use MB BGA tool to reprogram key. 

When you will need use this ELV Adaptor?

Unlock W204 ESL: Fix the locked ESL to normal one (NEC chip fatal error: 0xAA). This function need buy an extra NEC ELV adaptor, support W204 ESL and old Motorola ESL. You need select Adaptor option in ESL window