Check this:
https://gbatemp.net/threads/the-definitive-guide-to-wii-u-hacking.396828/
Edit: Ninja'd
PURCHASING A WII U
Which Wii U bundle has 5.3.2 or lower on it?
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Nintendo has started shipping updated bundles! It appears to only be the bundles with the game(s)
preinstalled. I highly recommend purchasing a bundle with the physical discs for a better chance of having a lower FW. I'm not responsible for your purchasing of a Wii U that does not have a released exploit.
Any bundles that include games released after August 2015 (Mario Maker, etc) will be above 5.3.2.
Check the
Serial Number Database to try to track down an old console!
2.1.0:
Super Mario 3D World and Nintendo Land Deluxe Set
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Mario Kart 8 Deluxe Set (Pictured set AND the set that includes the red Mario Wii wheel and red Mario Wii Remote Plus controller)
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ZombiU Deluxe Set
.
2.1.1:
Skylanders SWAP Force Basic Set
.
3.1.0:
New Super Mario Bros U and New Super Luigi U Deluxe Set
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The Legend of Zelda Wind Waker HD Deluxe Set
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4.0.0:
Just Dance 2014 Basic Pack
.
Wii Party U + Wii Remote Plus + Nintendo Land + New Super Mario Bros. U + New Super Luigi U Basic Bundle
.
4.0.2:
Super Smash Bros. Basic Pack
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5.1.2:
Super Mario 3D World and Nintendo Land Deluxe Set (Pre-installed)
Note:
Console purchased from Walmart in Illinois on 10/17/15 was on 5.3.2.
Console purchased from Best Buy online in Q4 2015 was on 5.3.2.
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5.2.0:
Splatoon and Mario Kart 8 Deluxe Set (Splatoon download code, Mario Kart 8 pre-installed)
Note:
Console purchased in December 2015 in Germany was on 5.4.0.
Console purchased on December 19, 2015 at Saturn-Shop in Austria was on 5.4.0.
Console purchased on December 21, 2015 at bol.com in the Netherlands was on 5.5.0.
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5.3.2:
Splatoon and Nintendo Land Deluxe Set (Splatoon download code, Nintendo Land pre-installed)
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Mario Kart 8 Deluxe (Preinstalled) + DLC
Note:
Console purchased from Best Buy in Canada on 10/17/15 was on 5.4.0.
Console purchased from Argos in Dublin, Ireland on 10/22/15 was on 5.4.0.
Console purchased from Jet.com in the USA around 10/23/15 was on 5.4.0.
Console purchased from GameStop in Virginia, USA around 12/12/15 was on 5.4.0.
Console purchased from Walmart in the USA in November 2015 was on 5.5.0.
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5.4.0:
Super Smash Bros. and Splatoon Deluxe Set (Pre-installed)