Hi Judith,
The short answer is... if at all possible I highly recommend you simply upgrade to a newer phone. After seven years I recently finally upgraded my HTC One M8 to a Pixel 4a. The Pixel I got was second hand so I got it for a good price. It's totally un-necessary to spend obscene sums of money on smartphones. But equally you can get a perfectly good one with recent tech for reasonable prices especially if you buy second hand.
If you can't or don't want to upgrade your phone then... you should NOT need to Root the HTC One M8 to be able to continue using it. Although the Android OS that comes on the HTC One M8 by now is so old that it might not be the most secure to have on your phone.
But I never had the problem you described with the phone being almost totally full from bloatware. If you don't have any media on the phone then there should be plenty of space in it's internal storage. You can also add an external SD card and save all your media to that.
Have you tried doing a proper Factory reset? Settings > Backup & reset > Reset phone > OK.
This should restore the phone to a state where there is still plenty of space in the internal storage, even after subsequent updates are applied.
If you haven't then you should definitely try a Factory reset although you should BACKUP anything you don't want to loose first!
If I were you I would sooner pay around £100 and get a decent second hand phone than waste any time rooting the HTC One M8. By now it is about 8 years old hardware so no matter what rooted OS you put on it then it will still be painfully slow and sluggish and only get moreso with each passing month as websites are designed and upgraded to require faster and more powerful phones to work properly.
Cheers,
Flex
The short answer is... if at all possible I highly recommend you simply upgrade to a newer phone. After seven years I recently finally upgraded my HTC One M8 to a Pixel 4a. The Pixel I got was second hand so I got it for a good price. It's totally un-necessary to spend obscene sums of money on smartphones. But equally you can get a perfectly good one with recent tech for reasonable prices especially if you buy second hand.
If you can't or don't want to upgrade your phone then... you should NOT need to Root the HTC One M8 to be able to continue using it. Although the Android OS that comes on the HTC One M8 by now is so old that it might not be the most secure to have on your phone.
But I never had the problem you described with the phone being almost totally full from bloatware. If you don't have any media on the phone then there should be plenty of space in it's internal storage. You can also add an external SD card and save all your media to that.
Have you tried doing a proper Factory reset? Settings > Backup & reset > Reset phone > OK.
This should restore the phone to a state where there is still plenty of space in the internal storage, even after subsequent updates are applied.
If you haven't then you should definitely try a Factory reset although you should BACKUP anything you don't want to loose first!
If I were you I would sooner pay around £100 and get a decent second hand phone than waste any time rooting the HTC One M8. By now it is about 8 years old hardware so no matter what rooted OS you put on it then it will still be painfully slow and sluggish and only get moreso with each passing month as websites are designed and upgraded to require faster and more powerful phones to work properly.
Cheers,
Flex