R7960P firmware not upgrading

Darn, no luck for me after unplugging all connections, rebooting and uploading using Chrome through the web portal app.  After my wife's meetings this week where she needs a connection, I may try the longer method to push the file to the router using Tftpd64 or windows' utility, but by all indications the upload process isn't the problem.  I'm not surprised but my hopes were going up seeing so many successes.  I am hesitant to attempt a factory reset to force a downgrade in case that doesn't work, since I won't have a replacement router to fall back on for probably over a month if I order the one I'm interested in today.  In the meantime, I'll definitely watch this thread to see if there's a trick I missed or got wrong.  Thanks all.