Got a RAV4.3 SR model

You have to buy a disc which will be a minimum of two years out of date by the time it’s issued.. 

as far as i know you have to take it to toyota to update,had to with mine same year as your rav4.
got mine updated last year for £100,so happy enough.

you cant buy a hard disc for my model, you cant download to unit either has to be toyota garage to update unit B9017

Where did you obtain that information from?

There was a map update released for T&G quite recently in April. Perhaps there are not updating the base software any more, but the map database is still being updated (for a charge).

In summary for "factory fit" sat nav units:

• B9004 (from 4.3 launch up to about 2008) is DVD based and updates are on DVD.
  
  (There were also dealer fit units around at the same time, the model numbers which escape me at the moment (TNS510?), which were SD card based).
• B9017 (from 2009 Facelift). Hard disk based. Was back to dealer for update. Tech info claimed it needed an update box plugging into the unit. There's an update socket behind the screen. Don't know of any third party update methods, but there may be some.
• Touch (& Go/Go plus) from about 2012 facelift. Update is via Toyota toolbox, which has to be loaded onto your PC.
  See: toyota.naviextras.com/shop/portal/howtostart
  Update is via the toolbox with a blank USB mem stick (at least 8GB). After taking a "fingerprint" from the car, the update is downloaded onto the USB stick, which is then used to transfer the update into the unit. Download and transfer from PC to USB stick can be a long process, depending on your inet connection etc. Update into the unit from the usb stick takes about 1 hour. If your PC is USB3 capable, a fast USB3 capable stick can help speed up the transfer from PC to stick. The "Toyota Toolbox" is not the greatest piece of software, but it does work with patience.
• Touch 2 (with Go/Go plus). From about 4.4 onwards. Update is via "MY Toyota" and the "e-store" Register for a "MY Toyota" account. Update is again via a USB stick, but the toolbox is no longer needed. Via "My Toyota", a zip file is download, which you just simply unzip onto a USB stick. Again USB3 can help here. You'll be prompted for a "fingerprint" code from the unit. (For the more technical, this fingerprint can actually be placed into an XML file in the USB stick root directory. It replaces a "dummy"/"default" fingerprint in the file, which means the update will proceed and will only prompt for East or West map loads into the unit, if you are using a European map update). Update into unit from mem stick is again about 1 hour.
  

Other maybe useful info:

Toyota map care gives free updates for 3 years (Possibly vehicle age dependant).

www.toyota-mapupdates.eu/ - Not sure the info on here is being updated. Updates listed via "MY Toyota" and the "Toyota toolbox" seem to give more up-to-date versions.

toyotamaps.online/ - Seems to offer cheaper "official" updates for touch & go/go plus & touch2. I've not tried them. Can't help wondering if they are "semi-pirate". Think you have to supply them with the fingerprint from your unit. (I wonder whether they have hacked the unit fingerprint keys and use that along with copies of the official maps/updates, but maybe they are legit).

OK, Well toolbox was OK for April 19 release paid update (which I didn't buy) a couple of weeks ago. (For the T&G+ I put in UC) :TU:

(Release is April 19, but map database compile is dated around end of 2018).

Just accessed the navigation system's data issue date. It says:

Data: 2010 - 2011 Ver.1
Gracenote (CDDB): Ver. 02421

Clearly my system is at least 8 years out of date, lotta roads changed in that time! Out of interest, what's that 'Gracenote' mullarky?