Both the parties, while refusing to participate in the challenge on June 3, had yesterday written to the Commission flagging certain issues.
The poll panel responded to the two parties separately today.
"The EVMs are not accessible to any unauthorised person at any stage before, during or after the polls and as such, the question of access to all the components, such as the motherboard for tampering the EVM machines does not arise," it told the Congress.
It also said that it had not promised a no-holds barred hackathon. "...No such promise about a no-holds barred hackathon was ever made or announced by the Commission... during the all Party Meeting on May 12, the Commission had clearly explained that it will offer an EVM challenge and not a hackathon."
It said the claim that it is backing off from a hackathon is "baseless".
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