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Hi! Sorry to hear that. This „booting x%“ occurs when unexpected behavior is detected on its USB port as your Ledger hardware wallet has security features built-in that protect it against hardware attacks.
The solution is to connect your Ledger device to a wall charger, ideally, or another computer that does not cause the problem until it reaches 100%. Once the device has finished rebooting, you should update its firmware right away before installing apps on it and managing your crypto.
Instructions to update the Nano X firmware: https://support.ledger.com/hc/articles/360013349800-Update-Ledger-Nano-X-firmware