Thank you, belevedere. Here's the thing.
File name "DT700_v2.3.109.4_DT730G_v3.1.61.9_DT820_v4.4.11.2_DT900_5.3.4.0_STD-SIP_FW.zip". DT820 - ITY models. I need FW for ITZ-24D - DT830.
The archive contains the files itk*.tgz, itk*.sig, itl*.tgz, itl*.sig, ity*.tgz, ity*.sig, but does not contain...