Does it delete files in flash after upgrade?

IoT Modules WCDMA Module
1

I am using UC200T-EM. After upgrading the product with the AT command, it stopped connecting to mqtt. I think that the certificates I wrote to flash were deleted with the upgrade. Is something like this possible?

2

Hi Seher_Maviļ¼Œ

I think you can download the certificate again and verify this

thanks