i think from last night apple stop signing to 4.2 firmware of iwatch.
[info] Starting ...
[info] Using LOCAL IPSW G:\APPLE WATCH FIRMWARES\SERIES 1 WATCH 0\MFC_Watch1,1_4.2_15S102_N27aAp_Restore_38mm.ipsw
[info] using cached version data
[info] Found device in Normal mode
[info] Identified device as Apple Watch S0 - 1st generation, n27aap, Watch1,1
[info] Extracting BuildManifest from ipsw
[data] Product Version: 4.2
[data] Product Build: 15S102 Major: 15
[data] Device supports Image4: true
[info] Variant: Customer Erase Install (IPSW)
[info] This restore will erase your device data.
[info] Found ECID 7519180899976
[info] Getting ApNonce in normal mode... [data] 0660032D9AA472D511AB0B778C9FF8B5F2718494
[info] tts>Trying to fetch new SHSH blob
[info] Getting SepNonce in normal mode... [erro] Unable to get SEPNonce from lockdownd
[info] failed
[warn] Unable to find BbChipID node
[note] Unable to find BbProvisioningManifestKeyHash node
[note] Unable to find BbActivationManifestKeyHash node
[note] Unable to find BbCalibrationManifestKeyHash node
[note] Unable to find BbFactoryActivationManifestKeyHash node
[note] Unable to find BbFDRSecurityKeyHash node
[warn] Unable to find BbSkeyId node
[info] Sending TSS request...
[erro] Unable to find required ApSepNonce in parameters
[info] Request URL set to
https://gs.apple.com/TSS/controller?action=2
[info] Sending TSS request attempt 1...
[erro] TSS server returned: STATUS=94&MESSAGE=This device isn't eligible for the requested build.
[erro] TSS request failed (status=94, message=This device isn't eligible for the requested build.)
[erro] tts>Unable to send TSS request
[erro] Unable to get SHSH blobs for this device
[info] Failed