Then why does this part fails for me?Try to downgrade? (little risks but if you follow correctly a guide, it should be fine)
No
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Now, navigate to Settings --> Other --> Profile. WHILE HOLDING THE L BUTTON, tap DS Profile. The screen should be a DARK blue on the top. As with regular CFW, the bottom screen should ideally flash white for a moment and then load the CFW. If it doesn't, hold power to reboot the system and repeat step 9. Make sure to hold L.