I have TBS 5520SE and it can lock 50e 11587h34290 32APSK but can't even get
TURKSAT_8K_TEST channel name due to many errors (btw 42e 11177v34290 TURKSAT_8K_TEST slideshows quiet well with SmartDVB and MPCVideoDec_skip_non_I-frames.7z (7,2MB)
https://yadi.sk/d/ZBA-K2-6UUV4TQ ). If TBS6522 can show (with Signal/Noise as minimum 14dB) 50e 11587h34290 32APSK
TURKSAT_8K_TEST well so problem with USB-bridge but if not - problem with demodulator Si21832 equal in 6522 and 5520SE.