Well her is the situation.
Because of undocumented aciton in my network I had problem with downloading bmp. Now it's ok, but this is it:
For display on Polycom IP550 phone you must use settings for 600, and also yu can use (208 x 110) that bmp dimesion. Works with 8BPP image

I got problems with showing bitmaps on Polycom 550 phones.
I tried both fot IP500 and IP600, but I'm still not able to see the bitmap.
I also noticed that there's no IdelDisplay so I put the bmp in both 1 and 61 field (for 500) and (for 600) in 1 and 65, but there's no displaz.
I also noticed error in logs:
0528122031|copy |4|03|Download of 'PMlogo.bmp' FAILED on attempt 1
0528122031|res |4|03|ResFinderC: Download - Failed to download file PMlogo.bmp, errno 0x380003.
0528122031|copy |3|03|'tftp://10.1.133.22/PMlogo.bmp' from '10.1.133.22'
0528122031|copy |3|03|TFTP download error
0528122031|copy |3|03|tftpLib error: tftp transfer failed: error 0x4b0008

0528122031|copy |4|03|Download of 'PMlogo.bmp' FAILED on attempt 1
0528122031|res |4|03|ResFinderC: Download - Failed to download file PMlogo.bmp, errno 0x380003.

Any suggestions?