With newer libjcat installed from given ppa in comment #4, and restarted the daemon now I can update firmware successfully. Thanks.
$ fwupdmgr --version runtime org.freedesktop.fwupd 1.7.5 runtime com.dell.libsmbios 2.4 compile org.freedesktop.gusb 0.3.4 runtime org.kernel 5.11.0-49-generic compile org.freedesktop.fwupd 1.7.5 runtime org.freedesktop.gusb 0.3.5
$ dpkg -l | grep libjcat ii gir1.2-jcat-1.0:amd64 0.1.9-1~20.04.1 ii libjcat-dev:amd64 0.1.9-1~20.04.1 ii libjcat1:amd64 0.1.9-1~20.04.1
With newer libjcat installed from given ppa in comment #4, and restarted the daemon now I can update firmware successfully. Thanks.
$ fwupdmgr --version .fwupd 1.7.5 .gusb 0.3.4 .fwupd 1.7.5 .gusb 0.3.5
runtime org.freedesktop
runtime com.dell.libsmbios 2.4
compile org.freedesktop
runtime org.kernel 5.11.0-49-generic
compile org.freedesktop
runtime org.freedesktop
$ dpkg -l | grep libjcat jcat-1. 0:amd64 0.1.9-1~20.04.1
ii gir1.2-
ii libjcat-dev:amd64 0.1.9-1~20.04.1
ii libjcat1:amd64 0.1.9-1~20.04.1