It is not available anymore on their website. You may try to get the old firmware from TP-LINK support team.
http://ticket.tp-link.com/index.php?/Tickets/Submit

i had communicate with them but they reply to me that they dont have it and if i want to reset it to the facoty settings and upgarde it again. hello????? are they crazy? it was fine with firmware of 2013 the new firmware is a mess. i cant believe it that they dont jave the old firmware. the does not help me at all. i want this old firmware,what company are they???

Yes, once it re-power running well, but it will happen again to my v3 hardware every 2-3 days sometime less after it power cycle. Web console displaying incorrectly, it like broken CSS in web console and we can not do anything, not able to access the reboot menu. so need someone who stand in front of the router to re-power it.

Please release your update firmware to fix this issue - the TL-R470T+ is great, but we need to admin/monitor the box.

@balitech Report the problem here directly. http://ticket.tp-link.com/index.php?/Tickets/Submit

@silence It seems that they misunderstood what you are looking for...But they do have an older firmware...