Using External DEM 10x10m

[ABraun]

@falahfakhri

Thanks a lot, but it seems for me stacked in QGIS, I did two times, but same results. Would you please to clarify the steps of QGIS, because I reproject it in both cases but slave is still empty.

just for clarification: After which step is the slave empty?
First I thought you wanted to use the 2m DEM for the topographic phase removal (because this was the problem in the topic you linked).
I don’t think it makes sense to use a 2m DEM for the back-geocoding of S1 SLC data. Especially if the covered area is much smaller than the S1 data. Use GETASSE30 and it works.