I bought myself an early version of an Atari 520ST with Tos 1.00 with only external floppy SF354 from a childhood friend.
I played with this baby like 25 years ago. The external floppy SF354 did not work anymore but the power supply and the Atari itself works like a charm.
I have now for 3 month trying to get this bad boy to work with an Gotek attatched inside of the SF354.
But i have tried everything i can think of and read forums and googled like 50 hours and no solution.
Im sure i attached the floppy cable right and that the jumpers are in the right place.
I started out with flash floppy but the furtherest i came was to get [Loading HXC Manager ...... on the screen. So i would guess i have the connection right. After trying out like 20 different HFE and CFG files for the Gotek i gave up and bought the HXC Firmweare from https://hxc2001.com/
And upgraded to the latest firmware and not i get [Loading HXC Manager ..... and after like 10 seconds i get 2 classic atari bombs on the screen.
So my question is should i give up this and buy a Atari STFM or STE since with an internal drive they seam to work great?
Or is it possible i have to upgrade my TOS to newer than 1.00?
Would be glad for any tips or suggestions, would love to give this one new life since im bond to it from my childhood

Very best regards.
Erik