Hi there, my friend has a Nexus 5 (like me) , and he wanted root so bad , and I tought him to root through Towelroot , however , he didn't unlock his bootloader, he got rooted and he got Xposed module on and running , but now he wants to have S2W which is achievable through flashing a kernel, but he doesn't have a recovery and he's bootloader locked , how can he achieve that SAFELY ?