for legal reason i cant share binaries but you can compile it yourself
check this for sdk installation and this for flashing in calculator (userland)
for building you should use these commands : make clean make userland.A.bin -j$(nproc)
(you can replace userland.A.bin by userland.B.bin depending on which slot you want the os to install on)
btw ik my code is a total mess and probably completly buggy pics :