Begin with the TSL 0.2.20 source archive. Edit the file version.sh to set the version to 0.2.21 and the version tag to 02l. Copy the official Linux kernel source tarball linux-5.4.124.tar.xz for Linux 5.4.124 to the system/linux directory. Edit the file system/linux/version.sh to set the version to 5.4.124. Run the script build.sh then the script package.sh. The update file is cd/tslcr02l.tsp .