Error saving blobs

[ItsOver23]

Getting this error while trying to save blobs on iPhone 6 on iOS 8.3.I'm using macOS 10.15 Catalina if that helps

[ItsOver23]

Full command line:
xushaowen@xushaowendeMacBook-Pro SSHRD_Script % sudo bash ./sshrd.sh 8.3
Password:
[] Waiting for device in DFU mode
[] Getting device info and pwning... this may take a second
img4tool version: 0.197-aca6cf005c94caf135023263cbb5c61a0081804f
Compiled with plist: YES
Saved IM4M to work/IM4M
Version: 9bfdde2b2456181045f74631683fba491d8bf4f2 - 38
libfragmentzip version: 0.64-aaf6fae83a0aa6f7aae1c94721857076d04a14e8-RELEASE
init pzb: http://appldnld.apple.com/ios8.3/058-14372-20150408-6F9D0D48-DAEB-11E4-B32A-926C90F2D2C2/iPhone7,2_8.3_12F70_Restore.ipsw
init done
getting: BuildManifest.plist
100% [===================================================================================================>]
download succeeded
Version: 9bfdde2b2456181045f74631683fba491d8bf4f2 - 38
libfragmentzip version: 0.64-aaf6fae83a0aa6f7aae1c94721857076d04a14e8-RELEASE
init pzb: http://appldnld.apple.com/ios8.3/058-14372-20150408-6F9D0D48-DAEB-11E4-B32A-926C90F2D2C2/iPhone7,2_8.3_12F70_Restore.ipsw
init done
getting: Firmware/dfu/iBSS.n61.RELEASE.im4p
100% [===================================================================================================>]
download succeeded
Version: 9bfdde2b2456181045f74631683fba491d8bf4f2 - 38
libfragmentzip version: 0.64-aaf6fae83a0aa6f7aae1c94721857076d04a14e8-RELEASE
init pzb: http://appldnld.apple.com/ios8.3/058-14372-20150408-6F9D0D48-DAEB-11E4-B32A-926C90F2D2C2/iPhone7,2_8.3_12F70_Restore.ipsw
init done
getting: Firmware/dfu/iBEC.n61.RELEASE.im4p
100% [===================================================================================================>]
download succeeded
Version: 9bfdde2b2456181045f74631683fba491d8bf4f2 - 38
libfragmentzip version: 0.64-aaf6fae83a0aa6f7aae1c94721857076d04a14e8-RELEASE
init pzb: http://appldnld.apple.com/ios8.3/058-14372-20150408-6F9D0D48-DAEB-11E4-B32A-926C90F2D2C2/iPhone7,2_8.3_12F70_Restore.ipsw
init done
getting: Firmware/all_flash/all_flash.n61ap.production/DeviceTree.n61ap.im4p
100% [===================================================================================================>]
download succeeded
Version: 9bfdde2b2456181045f74631683fba491d8bf4f2 - 38
libfragmentzip version: 0.64-aaf6fae83a0aa6f7aae1c94721857076d04a14e8-RELEASE
init pzb: http://appldnld.apple.com/ios8.3/058-14372-20150408-6F9D0D48-DAEB-11E4-B32A-926C90F2D2C2/iPhone7,2_8.3_12F70_Restore.ipsw
init done
getting: kernelcache.release.n61
100% [===================================================================================================>]
download succeeded
Version: 9bfdde2b2456181045f74631683fba491d8bf4f2 - 38
libfragmentzip version: 0.64-aaf6fae83a0aa6f7aae1c94721857076d04a14e8-RELEASE
init pzb: http://appldnld.apple.com/ios8.3/058-14372-20150408-6F9D0D48-DAEB-11E4-B32A-926C90F2D2C2/iPhone7,2_8.3_12F70_Restore.ipsw
init done
getting: 058-14388-073.dmg
100% [===================================================================================================>]
download succeeded
usb_timeout: 5
usb_abort_timeout_min: 0
[IOKit] Waiting for the USB handle with VID: 0x5AC, PID: 0x1227
CPID: 0x7000
Found the USB handle.
Now you can boot untrusted images.
[IOKit] Waiting for the USB handle with VID: 0x5AC, PID: 0x1227
Found the USB handle.
usb_timeout: 5
usb_abort_timeout_min: 0
[IOKit] Waiting for the USB handle with VID: 0x5AC, PID: 0x1227
CPID: 0x7000
Found the USB handle.
Now you can boot untrusted images.
[IOKit] Waiting for the USB handle with VID: 0x5AC, PID: 0x1227
Found the USB handle.
main: Starting...
getting get_sigcheck_patch() patch
applying patch=0x18038d830 : 000080d2
applying patch=0x18038d834 : c0035fd6
applying patch=0x18038d90c : 000080d2
main: Writing out patched file to work/iBSS.patched...
main: Quitting...
none
main: Starting...
getting get_boot_arg_patch(rd=md0 debug=0x2014e -v wdt=-1 nand-enable-reformat=1 -restore) patch
getting get_debug_enabled_patch() patch
getting get_unlock_nvram_patch() patch
main: Error doing get_unlock_nvram_patch()!
[-] An error occurred