Can SAR Mosaic Wizard process ENVISAT Precision Image(ASAR_IMP_1P) products? I used this tool but it failed to produce the desired mosaicing results

I tried to mosaic two ENVISAT Precision Image products acquired at the same date, but I cannot see anything from the results by the SAR Mosaic Wizard in the Radar of SNAP.
Is there Anyone can give some help?
Thanks in advance!

how do the image statistics look like? Are there any values?