[XPERIA X10 Android Development] 9Lukas5:
I have used this convert tool in which I have chosen as device the x10 and then this tool has copied a update-binary in, but don't know which. The updater script looks like this:

ui_print("Installing miuiandroid 1.8.19 by TripNRaVeR");
run_program("/sbin/mount", "/dev/block/mtdblock1", "/system");
run_program("/sbin/mount", "/dev/block/mtdblock9", "/data");
run_program("/sbin/mount", "/dev/block/mtdblock8", "/cache");
show_progress(0.500000, 0);
delete_recursive("/cache");
delete_recursive("/data");
delete_recursive("/system");
show_progress(0.500000, 40);
package_extract_dir("system", "/system");
symlink("/system/bin/busybox", "/system/xbin/busybox");
symlink("busybox", "/system/xbin/[");
symlink("busybox", "/system/xbin/[[");
symlink("busybox", "/system/xbin/arp");
symlink("busybox", "/system/xbin/ash");
symlink("busybox", "/system/xbin/awk");
symlink("busybox", "/system/xbin/basename");
symlink("busybox", "/system/xbin/bbconfig");
symlink("busybox", "/system/xbin/brctl");
symlink("busybox", "/system/xbin/bunzip2");
symlink("busybox", "/system/xbin/bzcat");
symlink("busybox", "/system/xbin/bzip2");
symlink("busybox", "/system/xbin/cal");
symlink("busybox", "/system/bin/cat");
symlink("busybox", "/system/bin/catv");
symlink("busybox", "/system/xbin/chgrp");
symlink("busybox", "/system/bin/chmod");
symlink("busybox", "/system/bin/chown");
symlink("busybox", "/system/bin/chroot");
symlink("busybox", "/system/xbin/cksum");
symlink("busybox", "/system/xbin/clear");
symlink("busybox", "/system/xbin/cmp");
symlink("busybox", "/system/xbin/cp");
symlink("busybox", "/system/xbin/cpio");
symlink("busybox", "/system/xbin/cut");
symlink("busybox", "/system/xbin/date");
symlink("busybox", "/system/xbin/dc");
symlink("busybox", "/system/xbin/dd");
symlink("busybox", "/system/xbin/depmod");
symlink("busybox", "/system/xbin/devmem");
symlink("busybox", "/system/xbin/df");
symlink("busybox", "/system/xbin/diff");
symlink("busybox", "/system/xbin/dirname");
symlink("busybox", "/system/xbin/dmesg");
symlink("busybox", "/system/xbin/dnsd");
symlink("busybox", "/system/xbin/dos2unix");
symlink("busybox", "/system/xbin/du");
symlink("busybox", "/system/xbin/echo");
symlink("busybox", "/system/xbin/ed");
symlink("busybox", "/system/xbin/egrep");
symlink("busybox", "/system/xbin/env");
symlink("busybox", "/system/xbin/expr");
symlink("busybox", "/system/xbin/false");
symlink("busybox", "/system/xbin/fdisk");
symlink("busybox", "/system/xbin/fgrep");
symlink("busybox", "/system/xbin/find");
symlink("busybox", "/system/xbin/fold");
symlink("busybox", "/system/xbin/free");
symlink("busybox", "/system/xbin/freeramdisk");
symlink("busybox", "/system/xbin/fuser");
symlink("busybox", "/system/xbin/getopt");
symlink("busybox", "/system/xbin/grep");
symlink("busybox", "/system/xbin/gunzip");
symlink("busybox", "/system/xbin/gzip");
symlink("busybox", "/system/xbin/head");
symlink("busybox", "/system/xbin/hexdump");
symlink("busybox", "/system/xbin/id");
symlink("busybox", "/system/xbin/insmod");
symlink("busybox", "/system/xbin/install");
symlink("busybox", "/system/xbin/ip");
symlink("busybox", "/system/xbin/kill");
symlink("busybox", "/system/xbin/killall");
symlink("busybox", "/system/xbin/killall5");
symlink("busybox", "/system/xbin/length");
symlink("busybox", "/system/xbin/less");
symlink("busybox", "/system/xbin/ln");
symlink("busybox", "/system/xbin/losetup");
symlink("busybox", "/system/xbin/ls");
symlink("busybox", "/system/xbin/lsmod");
symlink("busybox", "/system/xbin/lspci");
symlink("busybox", "/system/xbin/lsusb");
symlink("busybox", "/system/xbin/lzop");
symlink("busybox", "/system/xbin/lzopcat");
symlink("busybox", "/system/xbin/md5sum");
symlink("busybox", "/system/xbin/mke2fs");
symlink("busybox", "/system/xbin/mkfifo");
symlink("busybox", "/system/xbin/mkfs.ext2");
symlink("busybox", "/system/xbin/mknod");
symlink("busybox", "/system/xbin/mkswap");
symlink("busybox", "/system/xbin/mktemp");
symlink("busybox", "/system/xbin/modprobe");
symlink("busybox", "/system/xbin/more");
symlink("busybox", "/system/xbin/mount");
symlink("busybox", "/system/xbin/mountpoint");
symlink("busybox", "/system/xbin/mv");
symlink("busybox", "/system/xbin/netstat");
symlink("busybox", "/system/xbin/nice");
symlink("busybox", "/system/xbin/nohup");
symlink("busybox", "/system/xbin/nslookup");
symlink("busybox", "/system/xbin/ntpd");
symlink("busybox", "/system/xbin/od");
symlink("busybox", "/system/xbin/patch");
symlink("busybox", "/system/xbin/pgrep");
symlink("busybox", "/system/xbin/pidof");
symlink("busybox", "/system/xbin/ping");
symlink("busybox", "/system/xbin/pkill");
symlink("busybox", "/system/xbin/printenv");
symlink("busybox", "/system/xbin/printf");
symlink("busybox", "/system/xbin/ps");
symlink("busybox", "/system/xbin/pwd");
symlink("busybox", "/system/xbin/rdev");
symlink("busybox", "/system/xbin/readlink");
symlink("busybox", "/system/xbin/realpath");
symlink("busybox", "/system/xbin/renice");
symlink("busybox", "/system/xbin/reset");
symlink("busybox", "/system/xbin/rm");
symlink("busybox", "/system/xbin/rmdir");
symlink("busybox", "/system/xbin/rmmod");
symlink("busybox", "/system/xbin/route");
symlink("busybox", "/system/xbin/run-parts");
symlink("busybox", "/system/xbin/sed");
symlink("busybox", "/system/xbin/seq");
symlink("busybox", "/system/xbin/setsid");
symlink("busybox", "/system/xbin/sh");
symlink("busybox", "/system/xbin/sha1sum");
symlink("busybox", "/system/xbin/sha256sum");
symlink("busybox", "/system/xbin/sha512sum");
symlink("busybox", "/system/xbin/sleep");
symlink("busybox", "/system/xbin/sort");
symlink("busybox", "/system/xbin/split");
symlink("busybox", "/system/xbin/stat");
symlink("busybox", "/system/xbin/strings");
symlink("busybox", "/system/xbin/stty");
symlink("busybox", "/system/xbin/swapoff");
symlink("busybox", "/system/xbin/swapon");
symlink("busybox", "/system/xbin/sync");
symlink("busybox", "/system/xbin/sysctl");
symlink("busybox", "/system/xbin/tac");
symlink("busybox", "/system/xbin/tail");
symlink("busybox", "/system/xbin/tar");
symlink("busybox", "/system/xbin/tee");
symlink("busybox", "/system/xbin/telnet");
symlink("busybox", "/system/xbin/test");
symlink("busybox", "/system/xbin/tftp");
symlink("busybox", "/system/xbin/time");
symlink("busybox", "/system/xbin/top");
symlink("busybox", "/system/xbin/touch");
symlink("busybox", "/system/xbin/tr");
symlink("busybox", "/system/xbin/traceroute");
symlink("busybox", "/system/xbin/true");
symlink("busybox", "/system/xbin/tty");
symlink("busybox", "/system/xbin/umount");
symlink("busybox", "/system/xbin/uname");
symlink("busybox", "/system/xbin/uniq");
symlink("busybox", "/system/xbin/unix2dos");
symlink("busybox", "/system/xbin/unlzop");
symlink("busybox", "/system/xbin/unzip");
symlink("busybox", "/system/xbin/uptime");
symlink("busybox", "/system/xbin/usleep");
symlink("busybox", "/system/xbin/uudecode");
symlink("busybox", "/system/xbin/uuencode");
symlink("busybox", "/system/xbin/vi");
symlink("busybox", "/system/xbin/watch");
symlink("busybox", "/system/xbin/wc");
symlink("busybox", "/system/xbin/wget");
symlink("busybox", "/system/xbin/which");
symlink("busybox", "/system/xbin/whoami");
symlink("busybox", "/system/xbin/xargs");
symlink("busybox", "/system/xbin/yes");
symlink("busybox", "/system/xbin/zcat");
symlink("toolbox", "/system/bin/cmp");
symlink("toolbox", "/system/bin/date");
symlink("toolbox", "/system/bin/dd");
symlink("toolbox", "/system/bin/dmesg");
symlink("toolbox", "/system/bin/getevent");
symlink("toolbox", "/system/bin/hd");
symlink("toolbox", "/system/bin/id");
symlink("toolbox", "/system/bin/iftop");
symlink("toolbox", "/system/bin/insmod");
symlink("toolbox", "/system/bin/ioctl");
symlink("toolbox", "/system/bin/ionice");
symlink("toolbox", "/system/bin/kill");
symlink("toolbox", "/system/bin/lsmod");
symlink("toolbox", "/system/bin/mkdir");
symlink("toolbox", "/system/bin/nandread");
symlink("toolbox", "/system/bin/newfs_msdos");
symlink("toolbox", "/system/bin/notify");
symlink("toolbox", "/system/bin/printenv");
symlink("toolbox", "/system/bin/ps");
symlink("toolbox", "/system/bin/reboot");
symlink("toolbox", "/system/bin/renice");
symlink("toolbox", "/system/bin/rmdir");
symlink("toolbox", "/system/bin/rmmod");
symlink("toolbox", "/system/bin/route");
symlink("toolbox", "/system/bin/schedtop");
symlink("toolbox", "/system/bin/sendevent");
symlink("toolbox", "/system/bin/setconsole");
symlink("toolbox", "/system/bin/setprop");
symlink("toolbox", "/system/bin/sleep");
symlink("toolbox", "/system/bin/smd");
symlink("toolbox", "/system/bin/start");
symlink("toolbox", "/system/bin/stop");
symlink("toolbox", "/system/bin/sync");
symlink("toolbox", "/system/bin/top");
symlink("toolbox", "/system/bin/uptime");
symlink("toolbox", "/system/bin/vmstat");
symlink("toolbox", "/system/bin/watchprops");
symlink("toolbox", "/system/bin/wipe");
set_perm_recursive(0, 0, 0755, 0644, "system");
set_perm_recursive(0, 2000, 0755, 0755, "system/bin");
set_perm(0, 3003, 02750, "/system/bin/netcfg");
set_perm(0, 3004, 02755, "/system/bin/ping");
set_perm(0, 2000, 06750, "/system/bin/run-as");
set_perm_recursive(1002, 1002, 0755, 0440, "system/etc/bluetooth");
set_perm(0, 0, 0755, "/system/etc/bluetooth");
set_perm(1000, 1000, 0640, "/system/etc/bluetooth/auto_pairing.conf");
set_perm(3002, 3002, 0444, "/system/etc/bluetooth/blacklist.conf");
set_perm(1002, 1002, 0440, "/system/etc/dbus.conf");
set_perm(1014, 2000, 0550, "/system/etc/dhcpcd/dhcpcd-run-hooks");
set_perm_recursive(0, 2000, 0755, 0750, "system/etc/init.d");
set_perm(0, 0, 0755, "/system/etc/init.d");
set_perm(0, 2000, 0550, "/system/etc/init.goldfish.sh");
set_perm_recursive(0, 0, 0755, 0555, "system/etc/ppp");
set_perm_recursive(0, 2000, 0755, 0755, "system/xbin");
set_perm(0, 0, 06755, "/system/bin/sqlite3");
set_perm(0, 0, 06755, "/system/bin/make_ext4fs");
set_perm(0, 0, 06755, "/system/bin/zipalign");
set_perm(0, 0, 06755, "/system/xbin/apply_firewall");
set_perm(0, 0, 06755, "/system/xbin/apply_theme");
set_perm(0, 0, 06755, "/system/xbin/su");
show_progress(0.200000, 0);
run_program("/sbin/umount", "/system");
run_program("/sbin/umount", "/data");
run_program("/sbin/umount", "/cache");
ui_print("succesfully installed MIUI 1.8.19 by TripNRaVeR");

note: the ui_print at the beginning and the end are written from me^^

edit: and the new rom where on the phone, so the situation is not that it seemed to flash succcesfully but haven't written anything, it has written some thing, but the kernel is booting anyway...