Unlocking the bootloader of your Galaxy S25 will likely void its warranty. This is a common policy among most smartphone manufacturers, including Samsung. When you unlock the bootloader, you bypass certain security measures that are in place to protect the device's software integrity. As a result, manufacturers typically consider this action as a reason to void any existing warranty claims.
Specifically for Samsung devices, unlocking the bootloader not only voids the warranty but also triggers the Knox security feature, which cannot be reset even if you later relock the bootloader or restore the original firmware[7]. This means that any future hardware issues may not be covered under warranty if the bootloader has been unlocked.
While some manufacturers may allow for exceptions based on the nature of the damage (e.g., unrelated hardware issues), this is generally not the case with Samsung. If any problems arise that can be traced back to software modifications or abuse, your warranty will almost certainly be denied[1][2].
In summary, if you are considering unlocking your Galaxy S25's bootloader, be aware that it will void your warranty and could limit your options for service in the event of hardware failures.
Citations:[1] https://www.phonearena.com/news/Dont-unlock-the-bootloader-on-the-Motorola-Moto-X-Pure-Edition-unless-you-want-the-warranty-voided_id74051
[2] https://www.reddit.com/r/motorola/comments/1b7b6wz/dont_buy_a_motorola_and_definitely_dont_unlock/
[3] https://www.redmondpie.com/unlock-nearly-all-htc-bootloaders-while-sparing-your-warranty/
[4] https://xdaforums.com/t/q-unlocking-bootloader-may-void-warranty.1971720/
[5] https://forums.androidcentral.com/threads/unlocking-bootloader-voids-warranty.138891/
[6] https://www.reddit.com/r/LineageOS/comments/n7yo7u/a_discussion_about_bootloader_lockingunlocking/
[7] https://www.youtube.com/watch?v=9JemH_bbCvs
[8] https://support.google.com/pixelphone/thread/94497368/will-unlocking-bootloader-custom-rom-void-my-pixel-warranty?hl=en
[9] https://www.cpidserver.com/post/how-to-repair-and-cpid-fix-samsung-galaxy-s25-imei