Fido2 Installation on Flex fails

This is just a generic error message for app installation failure. It comes from our script for the application and it’s just our “best guess” as to why an applet may fail to install. We can’t actually determine, via the facilities provided by Fidesmo, if there is actually space or not.

What version of iOS are you running on your iPhone 14 pro? I will try to submit a ticket. If you can provide a log file of the logging data (attach as txt file) I will send it all to Fidsemo to get an opinion / support.

Here are the logs… A lot of them since I did a lot of testing.
log.txt (2.4 MB)

Is there any way to get a reading without taking the case off of an iPhone 14? I kinda start thinking that I should have gotten the Mega instead after all.

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On my Apex Flex I get a great reading through a wallet case + drivers license on my Pixel 8. I think the iPhone coils may have worse performance though.

But because you were able to deploy every other applet, my gut says it’s a software bug rather than a range/performance issue. Maybe try deploying it on a friends Android phone?

yeah, but with your thorough testing, I dont think that is your issue.

That would help, Is it still unopened inside the outer bag? Im not quite sure on Amals return policy, but you could ask to pay for a upgrade swap :man_shrugging:

I wouldn’t blame him if he said no though.

I do have another suggestion / solution for you to try for pretty cheap.
Give me a sec to put it together.

the best you can do is slowly and carefully try different orientations to see which is best.

it’s more about having a shape and performance profile that is ill-matched to the flex antenna shape. iPhone works great with cards and other tag types, and even x-series if held correctly.

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DT Club members get special treatment. If you want to exchange, reply to your order email and we’ll sort it out.


I have an Apex Flex and currently an S21+, It used to read OK, a bit of lining up, then muscle memory lead to faster and easier reads, I made a resonant repeater coil that lived between my phone case and phone, this improved my reading noticibly, I then modded it to a different form factor ( irrelevant to this discussion ) but it wasn’t tuned particularly well, so it didn’t perform as well as I had hoped.

Here’s a few examples if you want to go that path

Then @hamspiced made these

Here’s the video

I HIGHLY recommend these, I had noticeable improvements on the ones I made, but @Hamspiced ones are even GOODERER. When reading my ApexFlex, it’s simply…simple

Here’s his Tinide store for a fully built and tuned one

  • The only thing I am not sure of is, due to the iPhone NFC antenna location, I’m not sure if they will work or fit well in the iPhone case :man_shrugging:
    I’m not sure if @hamspiced can test that for you (I don’t have an iPhone or access to one or I would do it myself) , but I think he has a Pixel, but MAYBE access to an iPhone?

If not, maybe a make your own:
What may fit better in the iPhone is something like one of these

and a 22pf capacitor

Pretty cheap solution

NB: You might get lucky with the tuning, or you may need a VNA., which makes it mor expensive than just buying a #HammyResonantRepeaterJammy™

Anyway, just some thoughts and options for you to consider

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I don’t advertise my tindie page especially the resonant repeater project since it was 100% inspired by this forum and the work done by other members here. As a result of you read my profile I have a standing offer code for 50% off any DT member. However if someone reaches out to me with interest in one through the forums if I have extras I’ll send one out. I can’t ethically charge the members here for something that they essentially helped make. And considering it costs me pennies, a forever stamp isn’t going to break the bank.


I don’t say this lightly.
The highest complement from Down Under

@Hamspiced You’re a good cunt


Would you be interested in making a larger batch run of these for sale on DT?


I would like to have the V2 version completed. One that has the antenna built in as a trace. If i can get a working version completed back from jlcpcb im going to do a large order. I already had planned to shoot 100 or so your way once i get it properly working.

Let me get my house in order and DT will be the first to get a batch. when i do panelized orders from jlcpcb i usually do 500 unit runs (at least with the Flipper RGB Mods i do). So ill have plenty.


I’ve had coupling issues with the Apex Flex in my right arm while the case is on my iPhone and would love to get one of those NFC amplifiers. I’d want one at full price regardless, but I’ll take a discount if you’re offering :smile:

Nevermind about the discount code. I just realized that you might have been referring to people who pay the regular subscription to DT. I just have some DT implants. I went ahead and bought one though. I’m really excited about the prospect of being able to better couple with my Apex Flex :smile:

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I don’t believe so, im pretty sure he means ANYBODY here on the forum.

Correct, on my profile here on DT i have a discount code linked that has a blanket discount on my entire store on tindie. even if it isnt DT related.


DT Club members get special treatment. If you want to exchange, reply to your order email and we’ll sort it out.

As much as I love the idea of the Mega I gave it some thought and I think that the Mega is just too big to be comfortable on the wrist and I would prefer to keep my flex implants there for the time being.
Thank you for the offer!

and a 22pf capacitor

I think I will try that out when I have time to breathe again, thanks!

NB: You might get lucky with the tuning, or you may need a VNA., which makes it mor expensive than just buying a #HammyResonantRepeaterJammy™

I was kinda considering getting a NanoVNA anyway so… lol

Thank you for the offer @Hamspiced, I will try the DIY option before bothering you with anything tho.

I remember sending the logs on the forum somewhere but do not see it here… Weird.
Will look for those and send them your way.
iPhone is currently completely dead and won’t turn on for a while so I will send the iOS version alongiside a link to the logs.

Also sorry for completely disappearing like that and reappearing later. Life gets in the way lol
I sadly have the implanter ready and even enthusiastic about implanting all this stuff into me, but it is still all in a box and in their sterile bags because I do not want to implant something that I cannot really use.

What is sad is I just got a swimming pool pass that I cloned into a 5577, so I would have had a use if I implanted that one at least lol… Now I’m tempted to just implant the syringe one into me right now to weird out people at the pool.

Hmm. I just received my Apex Flex and I’m having the same issue on my Samsung Galaxy S23 Ultra. I can connect the Fidesmo Links but not FIDO Security.

The OTP seems to instantly fail as well. The app doesn’t even give me time to scan the implant like the Fidesmo Links App does, both just instantly fail. Is that normal?

Update: tried installing all apps. I could only connect to Fidesmo Links, and BoB Nordic Public Transit. All others fail. And BoB doesn’t give me the option to destroy.

The FIDO applet is large and requires multiple rounds of communication exchanges between the phone and the chip. It took me multiple attempts to get it to install.

I would also install the FIDO applet before you install anything else to rule out a storage issue.

Is your Apex implanted yet or are you trying to install applets on it through the packaging? I had very poor luck using my Samsung S23 Ultra to add applets to my Apex while it was still in the the plastic. The only way I even got close was to set my phone face down, place the plastic bag with the Apex in on top of it with the chip in a mostly vertical orientation on the back lower portion of the phone, then use some paper to lightly apply pressure to the back of the bag. I would then have the phone hanging slightly off the edge of the desk so I could tap the start button.

Also, I’ve experienced some weirdness with NFC on the S23. It seems that having a bad/failed read will sometimes stop NFC from operating until you close the app and/or stop and start NFC again. I’ve experienced this with both the Apex Manager app and the Yubikey app. My process now is that after every failed applet install I go to settings and turn NFC off and back on before trying again.

It is much easier to install applets into the chip using a USB reader and a PC. Another forum member recommended the ACS ACR1252U reader and it works very well. You can use Fidesmo’s fdsm tool to install applets from a computer. I’ve only used it on Windows, but I believe it will work on Mac and Linux as well

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@GrimEcho beat my post by 1 minute.

I just read it, and there’s some great advice in there.

anyway, here’s some bread crumbs

just received and still in the packaging, or Is it under the skin?

Any further updates from 3 hrs ago?
Still the same issues?

Did you try a manual deploy/ destroy?

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