Correct spelling, explanation: the word reset is correct in all three forms (present, past simple and past participle) due to the fact, that it is a version of the verb set, which is irregular and is spelled and pronounced the same way in all forms (set – set – set). Therefore reset is not only the base form but also past simple and participle forms. Reseted would imply that reset is a regular verb, which is untrue.

Definition of reset:
verb, to set something again
I have reset the programme but it still isn’t working.
Reset the timer to 10 seconds.

Incorrect spelling, explanation: reseted is a mistake, because reset is irregular, just like its base form set. -ed ending is added only to regular verbs, while past forms of irregular set (and thus also reset) are: set and set. This means that reset is the correct spelling in all 3 forms of the verb.

Incorrect spelling

Incorrect spelling