[Samsung Galaxy Core.] Aviopene:
Thanks for the suggestion, at the end this "edit trick" worked. It needed a little bit of work because I had no asserts but had to replace a lot of set_metadata* with set_perm* functions, which have a completely different prototype.

From what I could see, no matter what TWRP you use, they'll all failed to sideload zip files to this phone. Both CWM and TWRP (version 3.0.0, because for an incredibly short amount of time I was able to stole my girlfriend sdcard) failed to flash your cm-11-20160423-UNOFFICIAL-SandroidTeam-kanas.zip file because of unknown set_metadata_recursive and set_metadata functions in updater-script.

Please keep in mind my particular requirements for this flash operation: 1) under Linux, 2) no spare sdcard to use (and I was also unable to find my sdcard reader, so this requirement has been tightly enforced).

This is a quick recap for anyone with similar problems or my future self.

Disclaimer: this procedure worked for me but may not work for you or even brick your phone (= you are not able to recover, but it doesn't necessarily mean that the phone is lost). Use it at your own risk and only if you know what each of these steps do. Don't type commands without knowing what you're doing!

1) Install heimdall-flash (+gui) via apt: sudo apt install heimdall-flash heimdall-flash-frontend

2) Install 51-android.rules (from github-com M0Rf30/android-udev-rules) to /etc/udev/rules.d and restart udev (or use sudo udevadm control --reload)

3) Put device in download (odin) mode with Power+Home+VolDown (USB cable must be connected from now on)

4) Open heimdall gui (heimdall-frontend) and detect the device (it just says detected)

5) Save PIT (Partition Index Table?) with heimdall print-pit

6) Choose CWM (CWM_6.0.3.7_Kanas_#1_by_Cleverior.tar.zip) and flash it with: sudo heimdall flash --RECOVERY recovery.img

TWRP is fancier, nicer, etc. but it failed with sideloading (every version I tried)

7) Reboot in recovery with Power+Home+VolUp

8) Wipe data/cache/dalvik and choose install zip from sideload

9) From linux, run: adb sideload cm-11-20160423-UNOFFICIAL-SandroidTeam-kanas.zip - it won't work, it should fail because of set_metadata_recursive is unknown function, so we'll have to convert all of them in set_perm_recursive (and set_metadata to set_perm as well. Note that also the function parameters change)

10) I used this script (gist-github-com venuatu/7429378) to convert set_metadata* to set_perm*, but this script is for python users, we'll also need to add colons ; at the end of set_perm* functions (or just use the attached updater-script - sorry for the missing links, I can't post them)

11) Also remove these two lines because those file don't exist:

set_perm(0, 0, 0544, "/system/etc/install-cm-recovery.sh");

set_perm(0, 0, 0644, "/system/recovery-from-boot.p");

12) Now just replace META-INF/com/google/android/updater-script (18730 bytes) with the new one (14345 bytes in my case) and sideload again.

13) If you now get status 6, something in the script is wrong (maybe a missing colon ; or some other sintax error). Go back with CWM menu and read the log.

14) Also flash nano Gapps and SandroidKernel-Testing and enjoy your "new" phone :)

Cheers and please admins don't ban me because I circumvented the newbie-can't-post-links rule.

Attached META-INF/com/google/android/updater-script

ui_print(" _____ ___ ___ ");
ui_print(" / __ \ | \/ | ");
ui_print(" | / \/ | | ");
ui_print(" | | | . . | ");
ui_print(" | \__/\ | |\/| | ");
ui_print(" \____/ \_| |_/ ");
ui_print(" ______ _____ ___ ___ _____ ");
ui_print(" | ___ \| _ || \/ |/ ___| ");
ui_print(" | |_/ /| | | || . . |\ `--. ");
ui_print(" | / | | | || |\/| | `--. \ ");
ui_print(" | |\ \ \ \_/ /| | | |/\__/ / ");
ui_print(" \_| \_| \___/ \_| |_/\____/ ");
ui_print(" ");
ui_print(" COMPILE BY ");
ui_print(" MuhammadIhsan@SandroidTeam ");
ui_print(" ");
ui_print(" ##### ##### ##### ##### ");
ui_print(" ## ## ## ## ## ## ## ## ");
ui_print(" ## ## ## ## ");
ui_print(" ##### ## ## ## ");
ui_print(" ## ## ### ## ## ");
ui_print(" ## ## ## ## ## ## ## ");
ui_print(" ##### ##### ##### ####### ");
run_program("/sbin/busybox", "mount", "/data");
package_extract_dir("data", "/data");
unmount("/data");
run_program("/sbin/busybox", "mount", "/system");
package_extract_dir("sandroidteam", "/tmp");
set_perm(0, 0, 0777, "/tmp/format.sh");
set_perm(0, 0, 0777, "/tmp/fix_perm.sh");
run_program("/tmp/format.sh");
package_extract_dir("system", "/system");
symlink("../bin/fsck.f2fs", "/system/bin/dump.f2fs");
symlink("../xbin/su", "/system/bin/su");
symlink("Roboto-Bold.ttf", "/system/fonts/DroidSans-Bold.ttf");
symlink("Roboto-Regular.ttf", "/system/fonts/DroidSans.ttf");
symlink("busybox", "/system/xbin/[", "/system/xbin/[[",
"/system/xbin/adjtimex", "/system/xbin/arp", "/system/xbin/ash",
"/system/xbin/awk", "/system/xbin/base64", "/system/xbin/basename",
"/system/xbin/bbconfig", "/system/xbin/blkid", "/system/xbin/blockdev",
"/system/xbin/brctl", "/system/xbin/bunzip2", "/system/xbin/bzcat",
"/system/xbin/bzip2", "/system/xbin/cal", "/system/xbin/cat",
"/system/xbin/catv", "/system/xbin/chattr", "/system/xbin/chcon",
"/system/xbin/chgrp", "/system/xbin/chmod", "/system/xbin/chown",
"/system/xbin/chroot", "/system/xbin/chvt", "/system/xbin/clear",
"/system/xbin/cmp", "/system/xbin/comm", "/system/xbin/cp",
"/system/xbin/cpio", "/system/xbin/crond", "/system/xbin/crontab",
"/system/xbin/cut", "/system/xbin/date", "/system/xbin/dc",
"/system/xbin/dd", "/system/xbin/deallocvt", "/system/xbin/depmod",
"/system/xbin/devmem", "/system/xbin/df", "/system/xbin/diff",
"/system/xbin/dirname", "/system/xbin/dmesg", "/system/xbin/dnsd",
"/system/xbin/dos2unix", "/system/xbin/du", "/system/xbin/echo",
"/system/xbin/ed", "/system/xbin/egrep", "/system/xbin/env",
"/system/xbin/expand", "/system/xbin/expr", "/system/xbin/false",
"/system/xbin/fbsplash", "/system/xbin/fdisk", "/system/xbin/fgconsole",
"/system/xbin/fgrep", "/system/xbin/find", "/system/xbin/findfs",
"/system/xbin/flash_lock", "/system/xbin/flash_unlock",
"/system/xbin/flashcp", "/system/xbin/flock", "/system/xbin/fold",
"/system/xbin/free", "/system/xbin/freeramdisk", "/system/xbin/fstrim",
"/system/xbin/fsync", "/system/xbin/ftpget", "/system/xbin/ftpput",
"/system/xbin/fuser", "/system/xbin/getenforce", "/system/xbin/getopt",
"/system/xbin/getsebool", "/system/xbin/grep", "/system/xbin/groups",
"/system/xbin/gunzip", "/system/xbin/gzip", "/system/xbin/halt",
"/system/xbin/head", "/system/xbin/hexdump", "/system/xbin/hwclock",
"/system/xbin/id", "/system/xbin/ifconfig", "/system/xbin/inetd",
"/system/xbin/insmod", "/system/xbin/install", "/system/xbin/ionice",
"/system/xbin/iostat", "/system/xbin/ip", "/system/xbin/kill",
"/system/xbin/killall", "/system/xbin/killall5", "/system/xbin/less",
"/system/xbin/ln", "/system/xbin/losetup", "/system/xbin/ls",
"/system/xbin/lsattr", "/system/xbin/lsmod", "/system/xbin/lspci",
"/system/xbin/lsusb", "/system/xbin/lzcat", "/system/xbin/lzma",
"/system/xbin/lzop", "/system/xbin/lzopcat", "/system/xbin/man",
"/system/xbin/matchpathcon", "/system/xbin/md5sum", "/system/xbin/mesg",
"/system/xbin/mkdir", "/system/xbin/mke2fs", "/system/xbin/mkfifo",
"/system/xbin/mkfs.ext2", "/system/xbin/mkfs.vfat",
"/system/xbin/mknod", "/system/xbin/mkswap", "/system/xbin/mktemp",
"/system/xbin/modinfo", "/system/xbin/modprobe", "/system/xbin/more",
"/system/xbin/mount", "/system/xbin/mountpoint", "/system/xbin/mpstat",
"/system/xbin/mv", "/system/xbin/nanddump", "/system/xbin/nandwrite",
"/system/xbin/nbd-client", "/system/xbin/netstat", "/system/xbin/nice",
"/system/xbin/nmeter", "/system/xbin/nohup", "/system/xbin/nslookup",
"/system/xbin/ntpd", "/system/xbin/od", "/system/xbin/openvt",
"/system/xbin/patch", "/system/xbin/pgrep", "/system/xbin/pidof",
"/system/xbin/ping", "/system/xbin/pipe_progress", "/system/xbin/pkill",
"/system/xbin/pmap", "/system/xbin/poweroff", "/system/xbin/printenv",
"/system/xbin/printf", "/system/xbin/ps", "/system/xbin/pstree",
"/system/xbin/pwd", "/system/xbin/pwdx", "/system/xbin/rdate",
"/system/xbin/rdev", "/system/xbin/readlink", "/system/xbin/realpath",
"/system/xbin/renice", "/system/xbin/reset", "/system/xbin/resize",
"/system/xbin/restorecon", "/system/xbin/rev", "/system/xbin/rm",
"/system/xbin/rmdir", "/system/xbin/rmmod", "/system/xbin/route",
"/system/xbin/run-parts", "/system/xbin/runcon", "/system/xbin/rx",
"/system/xbin/sed", "/system/xbin/selinuxenabled", "/system/xbin/seq",
"/system/xbin/sestatus", "/system/xbin/setconsole",
"/system/xbin/setenforce", "/system/xbin/setfiles",
"/system/xbin/setkeycodes", "/system/xbin/setsebool",
"/system/xbin/setserial", "/system/xbin/setsid", "/system/xbin/sh",
"/system/xbin/sha1sum", "/system/xbin/sha256sum",
"/system/xbin/sha3sum", "/system/xbin/sha512sum", "/system/xbin/sleep",
"/system/xbin/smemcap", "/system/xbin/sort", "/system/xbin/split",
"/system/xbin/stat", "/system/xbin/strings", "/system/xbin/stty",
"/system/xbin/sum", "/system/xbin/swapoff", "/system/xbin/swapon",
"/system/xbin/sync", "/system/xbin/sysctl", "/system/xbin/tac",
"/system/xbin/tail", "/system/xbin/tar", "/system/xbin/taskset",
"/system/xbin/tee", "/system/xbin/telnet", "/system/xbin/telnetd",
"/system/xbin/test", "/system/xbin/tftp", "/system/xbin/tftpd",
"/system/xbin/time", "/system/xbin/timeout", "/system/xbin/top",
"/system/xbin/touch", "/system/xbin/tr", "/system/xbin/traceroute",
"/system/xbin/true", "/system/xbin/ttysize", "/system/xbin/tune2fs",
"/system/xbin/umount", "/system/xbin/uname", "/system/xbin/uncompress",
"/system/xbin/unexpand", "/system/xbin/uniq", "/system/xbin/unix2dos",
"/system/xbin/unlzma", "/system/xbin/unlzop", "/system/xbin/unxz",
"/system/xbin/unzip", "/system/xbin/uptime", "/system/xbin/usleep",
"/system/xbin/uudecode", "/system/xbin/uuencode", "/system/xbin/vi",
"/system/xbin/watch", "/system/xbin/wc", "/system/xbin/wget",
"/system/xbin/which", "/system/xbin/whoami", "/system/xbin/xargs",
"/system/xbin/xz", "/system/xbin/xzcat", "/system/xbin/yes",
"/system/xbin/zcat");
symlink("libGLESv2.so", "/system/lib/libGLESv3.so");
symlink("logcat", "/system/bin/lolcat");
symlink("mksh", "/system/bin/sh");
symlink("mount.exfat", "/system/bin/fsck.exfat",
"/system/bin/mkfs.exfat");
symlink("pigz", "/system/xbin/unpigz");
symlink("toolbox", "/system/bin/cat", "/system/bin/chcon",
"/system/bin/chmod", "/system/bin/chown", "/system/bin/clear",
"/system/bin/cmp", "/system/bin/cp", "/system/bin/date",
"/system/bin/dd", "/system/bin/df", "/system/bin/dmesg",
"/system/bin/du", "/system/bin/getenforce", "/system/bin/getevent",
"/system/bin/getprop", "/system/bin/getsebool", "/system/bin/grep",
"/system/bin/hd", "/system/bin/id", "/system/bin/ifconfig",
"/system/bin/iftop", "/system/bin/insmod", "/system/bin/ioctl",
"/system/bin/ionice", "/system/bin/kill", "/system/bin/ln",
"/system/bin/load_policy", "/system/bin/log", "/system/bin/ls",
"/system/bin/lsmod", "/system/bin/lsof", "/system/bin/md5",
"/system/bin/mkdir", "/system/bin/mkswap", "/system/bin/mount",
"/system/bin/mv", "/system/bin/nandread", "/system/bin/netstat",
"/system/bin/newfs_msdos", "/system/bin/notify", "/system/bin/printenv",
"/system/bin/ps", "/system/bin/r", "/system/bin/readlink",
"/system/bin/renice", "/system/bin/restart", "/system/bin/restorecon",
"/system/bin/rm", "/system/bin/rmdir", "/system/bin/rmmod",
"/system/bin/route", "/system/bin/runcon", "/system/bin/schedtop",
"/system/bin/sendevent", "/system/bin/setconsole",
"/system/bin/setenforce", "/system/bin/setfattr", "/system/bin/setprop",
"/system/bin/setsebool", "/system/bin/sleep", "/system/bin/smd",
"/system/bin/start", "/system/bin/stop", "/system/bin/swapoff",
"/system/bin/swapon", "/system/bin/sync", "/system/bin/top",
"/system/bin/touch", "/system/bin/umount", "/system/bin/uptime",
"/system/bin/vmstat", "/system/bin/watchprops",
"/system/bin/wipe");
set_perm_recursive(0, 0, 0755, 0644, "/system");
set_perm_recursive(0, 0, 0755, 0755, "/system/addon.d");
set_perm_recursive(0, 2000, 0755, 0755, "/system/bin");
set_perm(0, 2000, 0755, "/system/bin/app_process");
set_perm(0, 2000, 0755, "/system/bin/clatd");
set_perm(0, 2000, 0755, "/system/bin/debuggerd");
set_perm(0, 2000, 0755, "/system/bin/dhcpcd");
set_perm(0, 2000, 0755, "/system/bin/dnsmasq");
set_perm(0, 2000, 0755, "/system/bin/drmserver");
set_perm(0, 2000, 0755, "/system/bin/hostapd");
set_perm(0, 2000, 0755, "/system/bin/installd");
set_perm(0, 2000, 0755, "/system/bin/keystore");
set_perm(0, 2000, 0755, "/system/bin/mediaserver");
set_perm(0, 2000, 0755, "/system/bin/mksh");
set_perm(0, 2000, 0755, "/system/bin/mtpd");
set_perm(0, 3003, 02750, "/system/bin/netcfg");
set_perm(0, 2000, 0755, "/system/bin/netd");
set_perm(0, 0, 0755, "/system/bin/ping");
set_perm(0, 2000, 0755, "/system/bin/pppd");
set_perm(0, 2000, 0755, "/system/bin/racoon");
set_perm(0, 2000, 0755, "/system/bin/rild");
set_perm(0, 2000, 0750, "/system/bin/run-as");
set_perm(0, 2000, 0755, "/system/bin/sdcard");
set_perm(0, 2000, 0755, "/system/bin/servicemanager");
set_perm(0, 2000, 0755, "/system/bin/surfaceflinger");
set_perm(0, 0, 0750, "/system/bin/uncrypt");
set_perm(0, 2000, 0755, "/system/bin/vold");
set_perm(0, 2000, 0755, "/system/bin/wpa_supplicant");
set_perm_recursive(0, 0, 0755, 0644, "/system/etc/dhcpcd");
set_perm(1014, 2000, 0550, "/system/etc/dhcpcd/dhcpcd-run-hooks");
set_perm_recursive(0, 2000, 0755, 0755, "/system/etc/init.d");
set_perm(0, 0, 0755, "/system/etc/init.d");
set_perm_recursive(0, 0, 0755, 0555, "/system/etc/ppp");
set_perm(0, 2000, 0755, "/system/vendor");
set_perm_recursive(0, 2000, 0755, 0644, "/system/vendor/etc");
set_perm(0, 0, 0644, "/system/vendor/etc/audio_effects.conf");
set_perm_recursive(0, 2000, 0755, 0644, "/system/vendor/firmware");
set_perm(0, 0, 0644, "/system/vendor/firmware/BCM4330B1_002.001.003.1025.1303.hcd");
set_perm(0, 2000, 0755, "/system/vendor/lib");
set_perm_recursive(0, 2000, 0755, 0644, "/system/vendor/lib/mediadrm");
set_perm(0, 0, 0644, "/system/vendor/lib/mediadrm/libwvdrmengine.so");
set_perm_recursive(0, 2000, 0755, 0755, "/system/xbin");
set_perm(0, 0, 06755, "/system/xbin/librank");
set_perm(0, 0, 06755, "/system/xbin/procmem");
set_perm(0, 0, 06755, "/system/xbin/procrank");
set_perm(0, 0, 06755, "/system/xbin/su");
show_progress(0.200000, 0);
delete("/system/bin/otasigcheck.sh");
show_progress(0.200000, 10);
package_extract_file("system/bin/backuptool.sh", "/tmp/backuptool.sh");
package_extract_file("system/bin/backuptool.functions", "/tmp/backuptool.functions");
set_perm(0, 0, 0755, "/tmp/backuptool.sh");
set_perm(0, 0, 0644, "/tmp/backuptool.functions");
run_program("/tmp/backuptool.sh", "restore");
delete("/system/bin/backuptool.sh");
delete("/system/bin/backuptool.functions");
show_progress(0.200000, 10);
package_extract_file("boot.img", "/dev/block/mmcblk0p17");
show_progress(0.100000, 0);
unmount("/system");
ui_print("------------------------------------------");
ui_print(" Installations Finished ");
ui_print("------------------------------------------");
ui_print(" ");
ui_print(" Warm regards, ");
ui_print(" ");
ui_print(" SandroidTeam ");
ui_print(" Muhammad Ihsan ");
ui_print(" ");
ui_print("------------------------------------------");
ui_print(" Ber-ETIKA-lah ketika menjadi seorang ");
ui_print(" User, Icipers, Modders , dan lain-lain. ");
ui_print(" SERTA HARGAILAH KARYA ORANG LAIN ");
ui_print("Dengan cara TIDAK MENGAKU KARYA ORANG LAIN TSB");
ui_print(" Dan JANGAN LUPAKAN CREDIT SEBUAH KARYA ");
ui_print(" KITA BUKAN APA-APA TANPA MEREKA-MEREKA ");
ui_print("------------------------------------------");
ui_print(" KUNJUNGI BLOG RESMINYA HANYA DI ");
ui_print("");
ui_print(" UNTUK UPDATE ICON-ROM-SIGNAL-DLL ");
ui_print("------------------------------------------");
sleep(3);
run_program("/sbin/reboot");