crwdns2933897:0crwdne2933897:0

My backspace button doesn’t work anymore

I bought it used from a trusted eBay seller and the backspace key worked for a while but stopped have to use macro keys to use backspace how can I fix this?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0