OTA update stopped mid-way or at the end.

[muh-1-1]

Hello,
After fighting with my redme filepicker, which does not pick a file (known problem) and with CRC error, solved by fix MTU of 247 (from another issue) I have another problem. If I upload uncompressed .bin file (4 mB), it stops at sector 480 ( 2 Mb in), tries 3 times and quits. If I zip it with pigz, it's size drops to 900 mB. Now it stops at the last sector of the file, retries 3 times and quit.