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by accident I removed initial sector and could not boot neither system. Now I`ve setup a grub where I can at least boot windows. I still have the config files from syslinux in: /dev/sdb5

Grub and Syslinux are there. Before the removal I was using syslinux.

Syslinux.conf holds the following contents:

# Config file for Syslinux -
# /boot/syslinux/syslinux.cfg
# Comboot modules:
#   * menu.c32 - provides a text menu
#   * vesamenu.c32 - provides a graphical menu
#   * chain.c32 - chainload MBRs, partition boot sectors, Windows bootloaders
#   * hdt.c32 - hardware detection tool
#   * reboot.c32 - reboots the system
#   * - shutdown the system
# To Use: Copy the respective files from /usr/lib/syslinux to /boot/syslinux.
# If /usr and /boot are on the same file system, symlink the files instead
# of copying them.
# If you do not use a menu, a 'boot:' prompt will be shown and the system
# will boot automatically after 5 seconds.
# Please review the wiki:
# The wiki provides further configuration examples

PROMPT 0        # Set to 1 if you always want to display the boot: prompt 
# You can create syslinux keymaps with the keytab-lilo tool
#KBDMAP de.ktl

# Menu Configuration
# Either menu.c32 or vesamenu32.c32 must be copied to /boot/syslinux 
UI menu.c32
#UI vesamenu.c32

# Refer to
MENU COLOR border       30;44   #40ffffff #a0000000 std
MENU COLOR title        1;36;44 #9033ccff #a0000000 std
MENU COLOR sel          7;37;40 #e0ffffff #20ffffff all
MENU COLOR unsel        37;44   #50ffffff #a0000000 std
MENU COLOR help         37;40   #c0ffffff #a0000000 std
MENU COLOR timeout_msg  37;40   #80ffffff #00000000 std
MENU COLOR timeout      1;37;40 #c0ffffff #00000000 std
MENU COLOR msg07        37;40   #90ffffff #a0000000 std
MENU COLOR tabmsg       31;40   #30ffffff #00000000 std

# boot sections follow
# TIP: If you want a 1024x768 framebuffer, add "vga=773" to your kernel line.

LABEL arch
    MENU LABEL Arch Linux
    LINUX ../vmlinuz-linux
    APPEND root=UUID=8084cf06-452a-4e04-a89a-0f017461b727 ro quiet
    INITRD ../initramfs-linux.img

LABEL archfallback
    MENU LABEL Arch Linux Fallback
    LINUX ../vmlinuz-linux
    APPEND root=UUID=8084cf06-452a-4e04-a89a-0f017461b727 ro
    INITRD ../initramfs-linux-fallback.img

LABEL windows
        MENU LABEL Windows
        COM32 chain.c32
        APPEND hd0 1

        MENU LABEL HDT (Hardware Detection Tool)
        COM32 hdt.c32

LABEL reboot
        MENU LABEL Reboot
        COM32 reboot.c32

        MENU LABEL Power Off

Arch is located at /dev/sdb3

I would like to recover it. Is it possible? At the momment. I have grub able to boot windows. Can I make the transition back to my old syslinux? If so how should I proceed?

I also have grub in /dev/sdb3 where arch is located. How do I set /dev/sdb5 back to the "default" loader?

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Fixed with help of people in #arch at freenode.

All I had to to was to run syslinux-install_update -iam /dev/sdb and it did rewrite my mbr.

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