How to convert the Britax advansafix iSize from harness to booster mode

This video shows you how to turn your Britax Advansafix iSize into a high back booster. This is also how you convert the Britax Advansafix 4 M and R.

[@Othi-po1go]

Pulled my hair out taking apart the whole chair with the provided instructions. Took half an hour to put back together, then 3 minutes to do what you did! Thank you

[@user-vq9vj6cg5i]

Thanks for this clear and complete video, you saved me from hours wasted to try understanding the poor Britax paper user manual.

[@editaklimova775]

Thank you so much for this video! I was getting so frustrated with the written instructions, this was so clear and simple. Huge thanks!

[@user-up5pm6bi5b]

I've just done this second child. I still don't know how I would manage this without your videos so a huge thanks.

[@NicoleCox-ro7mp]

That was really clear. The written instructions are terrible and the illustrations really small. The official, dubbed video is terrible!

[@jurajbarbus5654]

Great video, much better than the official ones. I would like to add one pro safety tip if you have advansafix IV R: the pockets in the backrest to store the 5point belt buckle are not large enough for the buckle to fully fall in (as there are structural plastic ribs in the backrest).. it fits but a small (but rather sharp and pointy) portion of the buckle (both halves) protrudes to the backrest. You put 3 layers of padding over it (when i count the belt pads) but i could still feel it when pushed. This is far from ideal as these pieces would be able to stab your child in the back in the event of an accident. So the best solution is to remove the buckle completely - it is fortunately not that difficult. The shoulder straps are connected together at the back of the seat with a metal piece from which they can be undone and both partsof the buckle then removed. Without doing this I find the conversion on the Advansafix IV R model unsafe.

[@carseatkat]

Hi, I’ve not found that issue with the advansafix and cannot feel any sharp edges - there is a knack to getting them to fit I found. I wouldn’t recommend to anyone to remove a harness from a car seat if they have any intention of using the harness again in future, as there is no guarantee of it being reinstalled correctly (in my experience, it is not installed correctly!)

[@srebrny80]

Thank you for the great explanation and demonstration. You helped me a lot.

[@staszek1985]

Thank you for the detailed guideline! Really helpful!

[@marks1404]

Absolutely brilliant video thank you, the factory tape had been undone with my order from Amazon so wasn't sure if anything was missing, such as the secure guard, but you've just shown exactly where it is! I was also hoping there had been some padding taken from under the bum area of the seat, but it looks as if it really is meant to be that hard!! Not so good. But thank you for the video!

[@annepetriskov6413]

Thank you! I've been searching all over for a video instruction on this!

[@joannamcmahon8256]

Thank you this was SO helpful! Made the whole experience completely stress free 👍🏼

[@carseatkat]

No problem!

[@sunnys284]

Amazing, made my life easier. Not only myself like many others but Britax should thank you for sharing this video. Superb, many thanks.

[@Piki279]

You are a life savior. Britax has a awfully bad manual. Your video helped me a lot.

[@dino0rules]

Your videos should be the ones on the Britax romer KZbin page not the voice over dude because you just explain the whole process so easily

[@pauledwards5245]

Amazing, I could have never done this without your video. I could not follow the official instructions at all. Thank you 🙂

[@pollybowman1550]

Thank you so much for this video! So easy to follow and saved me loads of time. Thank you!

[@alidavies111]

Brilliant video, so easy following your steps. Thank you!

[@simonwhitworth2040]

Amazing video, Kat! I've just replaced the older carseat with the Avansafix and was clueless as to how to turn it into one that would take a car seat belt for my four year old son. Your video was clear and made it happen. Thanks! :D

[@carseatkat]

You’re welcome!

[@davidszalatnay2405]

You saved my day! Thanks from Switzerland. 👍

[@iksiu]

Thank You so much for this guide!

[@AutisticDutchie]

Thank you for this! The instruction booklet was impossible for me to decipher.

[@muge11o]

Excellent video - a lot better than the official "guides" which I found very frustrating...

[@bigmacn]

It would have taken me hours to decipher the instruction manual with its tiny pictures. Thank you very much!

[@sarahplummer8316]

Thank you so much! So much easier than the manual!

[@Ramonti07]

What a brilliant video and so helpful. Thank you!

[@kristinalojova5368]

Thank you so much for this video!❤️

[@momolulukiki]

Thank you very much for you great video! I could! It is super helpful. I didn't understand the paper instruction manual at all. This video should be official manual video of this product :)

[@deryaaroz1078]

Special thanks for loosen the shoulder starps god bless you ❤

[@Hansoid]

Used your excellent video along with the "user instructions" . Your video definitely provided over 90% of the method compared to the britax römer leaflet. Thank you Kat.

[@delprestonroadie6606]

Thank you for this, very helpful

[@user-ej4qr5ic2v]

Thank you for so useful guide.

[@WillWynne-wompkin]

Very helpful. Thank you!

[@TonyTheHitman1981]

You are my HERO!!!!

[@CHR987654321]

Thank you very much, very helpful!!

[@Baumlausable]

very well explained!

[@Starterman]

Thank you so much!

[@user-zg5rm3ns8l]

Great Video. Helped a lot. As the others said the written instruction is terrible

[@valentinyordanov9249]

Thank you! 🙏🏼

[@javiersanchez9940]

Great explanations!!

[@MarioEspada-eb5lx]

Super, many thanks!

[@robertobejarano]

La mejor explicación que he visto en internet. ❤

[@julienb.3612]

Thanks for sharing that, so usefull ! 🙏

[@vozzkan]

Thank you so much

[@franclemenzza5785]

Thanks so much☺️😘😘

[@Tamic494]

Very useful thank you

[@das_schnitzel]

Incredible video! Thank you!!

[@das_schnitzel]

Just went and did it! No idea what I would have done without your video. Thank you so so much from a dad who promised his wife he'd do this 🙏🙏🙏

[@ewaostasiuk2950]

Thank you!!!

[@tugcef]

Very helpfull!!! Thank you

Thank you!

[@all4ferrari]

You're great! Thank you kat! ^_^

[@navstevnice7569]

Thank you❤

[@FeaRi]

Very very helpfull. Thanks a lot from Germany 👍

[@wallofshame4012]

Can't thank you enough!

[@andrasbastyi]

Great video! Following your steps it was easy to convert the seat. // Nagyszerű video! Követve az utasításaid nagyon egyszerű volt az ülést átalakítani.

[@YouJustGotMerkd]

thank you! was wondering how on earth i could raise the headrest for my poor daughter who was getting a crooked neck from this not being high enough!

[@vicusya]

Many thanks from Ukraine👐

[@monsterrgreen]

Thanks

[@andreead226]

Thank you so much for this video. Any chance you could pls show how to loosen up harness? Our child is still small so we would use it with 5 point harness but for the love not money we can make it work. Thank you.

[@bukshyrecording2448]

thanks for this. somehow my problem is that the headrest keeps our daughters head forward, so if she falls asleep, her head is very badyly just dropping forward. that was in the 5 point version and today we'll try it in the 3 point version to see, but it already seems somehow the headrest is just making her head to lean too much forward, so she'll be dropping it once asleep :/

[@carthick1000]

Thanks for the useful video. Do you know where XP-Pad is located?

[@user-cj2hz7iy9n]

Спасибо большое!

[@vitblazek3009]

Thx

[@Stewie85esp]

Muchas gracias esto no aparece en las instrucciones!

[@joetyrrell6131]

Thank you for this. The instructions are quite poorly written. This is perfect.

[@panrous1806]

Hi! Great video! I have a question. I installed the car seat of the video and when I drive and hit small road bumps I hear a noise like squeaking. Like to plastics touch each other. Do you have any idea where the noise comes from? Headrest? Maybe from the space where the base and the seat come together?

[@laural9881]

Really helpful video. But as a first time mum not sure how to put seatbelt in next or how high to have back rest or how to install xp pad. Can you help?

[@carseatkat]

Hi, I can’t help with that I’m sorry as I now work for another brand. Your retailer or Britax themselves will be able to help you though 😊

[@ekinates7262]

👏

[@HannahPalser]

Bit of a random one, but wondered if you’ve still got it, and if you can send some pics of the back straps and how they’re threaded through?! Ours have come loose while in storage and we can’t work out how to set them up again!

[@carseatkat]

Hi, I can’t help with this I’m sorry (I work for another manufacturer now) but your retailer or Britax will be able to help you with this 😊

[@Zduneqq]

AWESOME!Literrly Germans!

[@nitrogen057]

Thank you!

[@tushar37]

Thank you!