Error Booting Sunstorm for iphone 6 12.5.7 to 11.3

[TKizd]

[] Creating working directory
[] Unzipping IPSW
[*] Getting ProductBuildVersion
Traceback (most recent call last):
File "/Users/taikizd/Downloads/TEST/sunst0rm-main/sunstorm.py", line 395, in
main()
File "/Users/taikizd/Downloads/TEST/sunst0rm-main/sunstorm.py", line 385, in main
prep_boot(args.ipsw, args.blob, args.boardconfig,
File "/Users/taikizd/Downloads/TEST/sunst0rm-main/sunstorm.py", line 237, in prep_boot
ibss_iv, ibss_key, ibec_iv, ibec_key = utils.api.get_keys(
^^^^^^^^^^^^^^^^^^^
File "/Users/taikizd/Downloads/TEST/sunst0rm-main/utils/api.py", line 17, in get_keys
for dev in f['keys']:
~^^^^^^^^
KeyError: 'keys'