json updater not working

[zerofrip]

It downloads to /storage/emulated/0/Android/data/com.smartpack.kernelmanager/files/kernelUpdater/Kernel.zip but fails to flash
Environment
Nothing Phone (1)
Android 15
json file

{

"kernel": {
"date": "2025-02-17",
"name": "Unofficial DerpFest Spacewar Kernel",
"version": "5.4.280-DERPv2.4+",
"link": "https://github.com/zerofrip/derpfest_spacewar_kernel/releases/latest/download/Uo_derp_spacewar_kernel.zip",
"changelog_url": "https://raw.githubusercontent.com/zerofrip/derpfest_spacewar_kernel/refs/heads/derp15.1/ChangeLog.txt",
"sha1": "53cf3fbb0b02d013a2c7b699f0c043f21ce2ea3d"
},
"support": {
"link": "https://github.com/zerofrip/derpfest_spacewar_kernel/discussions"
}
}

It works fine with franco kernel manager