Hello colleagues, I am repairing a price verification equipment NCR brand, To finish the process I must install a new Eprom memory with its firmware OK; The original code of the Eprom is AT27LV020A 12JC, encapsulated PLCC32; I asked for Ebay 05 memories, it turns out that by reading it with my programmer Minipro TL866, I find that everyone has different data, which indicates that these memories are used. With the Minipro programmer DOESN'T let it be deleted, the erase option is automatically disabled when I read the Eprom AT27LV020A 12JC. However, Eproms of other codes if you let me delete and save OK. Query: Can the Minipro programmer record data on an Eprom AT27LV020A 12JC? Can the data of an Eprom AT27LV020A 12JCU be deleted or not? It is assumed that without buying a new Eprom AT27LV020A 12JC it has to come if data is blank and allow data to be recorded on it. The original firmware is recorded in another PLCC32 eprom of another brand but of the same capacity and code, it was recorded ok but the equipment does NOT work, it only accepts Eprom of the same brand and code. Having a partner with more experience with the Eprom of these types clarifies these doubts, Regards,