Nexus 7 (2012) stuck in "no command" bootloop

SOS

Anyone take pity on a female pensioner. My husbands pad has gone into the No Command. I've download the toolkit as mentioned above, but I have no idea where to go from there. The pad froze and when rebooted got this.
 

Forum statistics

Threads
958,205
Messages
6,976,084
Members
3,164,016
Latest member
Antlon