aqprox appEB02G Mode D'emploi page 52

. On TF card

After inserted a TF card, if the reader has no response, please
take out and insert again.

Do not remove TF card or turn off reader during data writing or
reading to prevent damage to data and to the reader.

Make sure the TF card is unlocked before writing or deleting
data in the TF card.

Backup your files and data before formatting the TF card. Please
format the TF card in FAT.
Precautions and Maintenance 23