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Problem when use ftp and RL Flash-FS

I'm working on a luminary LM3S9b92 with MDK 4.72a and RTX.
I'm using RL FLASH-FS with a SPI FLASH device.
I want to download text and binary files with ftp to the SPI-FLASH on my board and I'm usign FTP_uif.c
The size of binary files is about 180Ko, the size of text files is about few bytes

1) Before download, I had 4 files in the Flash. After downloading a binary file, all files are deleted ...

2) If I use the del function to delete the file before download, all files in flash are deleted ...

3) I don't have problems when downloading small text files

4) I had already used these functions for another similar project, with no problems

Any suggestions ?

T. Cochard