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If bootloader unlock field says no,there is no chance.
You could check XDA forum,but I don't know if you will find anything.Maybe some will ask for money in exchange of some apps.
If the bootloader unlock status says No then is is either a network or country restriction, Flashing another firmware will not change this and some device do allow custom recoveries to be installed on a locked bootloader but you will not be able to install custom Roms