I can't get osd hdzero freestyle , video is ok. I have hdzero connected to r4/t4 of xilo FC https://getfpv-media.s3.amazonaws.com/wy...ual_V2.pdf. It says this is destined for GPS. But to get video I have to setup msp on uart 6. I  set display port on uart 5... but no osd BF 4.3.2

Most likely reason is firmware on vtx doesn't match firmware on goggles. Flash both to the newest firmware.

I have vtx on 1.3 and latest 9.1 on goggles

Maybe that UART4 (says for GPS...in doc) can't do MSP ? I saw people have RX on UART4 and VTX on UART3 on this FC

any uart should be able, only a firmware issue could give, source conflict could cause something, thats very rare.

how did you enable display port, did you choose "hdzero preset" to enable displayport?
if not, give it a try - it would do the -1 math for displayport for you.

I am doing "set displayport_msp_serial" but it gives me hard time, can't remember after save etc

it does also enable hd osd same time by applying the hdzero preset in bfc.

do get osd that way?

if you go to the osd tab and cant enable hd osd, get sure you didnt custom build the firmware and disabled "hd osd".
i did that on a buddies quad xD remember such things can be difficult xD

if you didnt get it, provide an image of your wireing, maybe there is rx and tx wrong attached?

hd presets didn't help, is it possible to have video but no OSD with rx and tx wrongly attached ?

yes - check that again ;-)
you dont need a flightcontroller to use hdzero, you can mount it on an rc car as example.

a buddy soldered rx and tx wrong :-)
manufacturers does sometime show tx or rx, aometimes they show where it has to be soldered on fctx or fcrx, hdzero does display all of them xD but there comes mistakes from the different sort informations by manufacturers.

was you able to solve it?

not yet