Please tell me you fully backed up first ??
https://gbatemp.net/threads/backup-...-your-biskeys-tseckeys-keys-txt-guide.513386/
You can use sx os if you wish making sure to use the latest payload/boot.dat files from there website tho so you dont burn ya fuses ....
Or run hekate payload first then run the sxos payload from hekate if u want...
Or use a free open source cfw reinx reijx etc...with hekate..
Aslong as you take a fuse check bypass method you may revert back to 1.0
Also systems 1.0 dont have as many keys as say a 5.1.0 system,
In my backup guide your get everything you need,, to get your keys and backup your emmc/nand