I have used TagWriter to chance data in NexT implant, but now only thing app says is “store failed”. Can’t format or write. TagInfo app can’t get any reasonable infos. Store size varies from 40bytes to 820bytes in every read. I don’t think anything is bricked… Or I hope so 
Hey! NFC Tools app works perfect! Everything goes as it should go and reads give Mifare Ultralight 820byte precisely from read to read. Problem solved by changing app 
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Great stuff, some people prefer it.
Most chips are NXP manufactured, so you would expect them to work more reliably with their own app… obviously not the case.
I think @turbo2ltr prefers NFC Tools (pro) and he knows his shit…
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