The revision to the $50,000 reward was posted on social media on Friday, drawing some negative responses from friends who still hold out hope for the 25-year-old.

Mr Srawn's family took out a print commercial in The Canberra Times on Wednesday, advertising for well-experienced hikers or search teams to find Mr Srawn, who went missing in the Kosciuszko National Park last month.

The renewed reward follows the decision by NSW Police to scale back the search efforts and the official withdrawal from the search of the Westpac Life Saver Rescue Helicopter earlier this week.

Search participants are required to cover their expenses during the efforts and only the searchers that find Mr Srawn will receive the reward.

The advertisement comes amid an ongoing campaign by Mr Srawn's family and friends, who have been targeting both the Australian and Canadian governments through Facebook and Twitter.

Facilitators of the official Facebook page, titled ''Help Find Prabh Srawn - Missing Bushwalker'', posted on Wednesday that they were closer to finding the bushwalker. ''The private teams hired by family have narrowed down the search to a specific area,'' it read.

The family of the Bond University student plans to stay in Jindabyne until searchers find Mr Srawn, who was last seen wearing a white T-shirt and blue jeans.

NSW Police believe he may be wearing a red and black ski jacket including the words ''Frogg Toggs''.

He was last seen when he parked his car at Charlotte Pass Village on May 13.

Subzero night-time temperatures have prevailed in the Snowy Mountains since the day Mr Srawn went missing.