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Edit store price tags using Flipper Zero

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Re: Edit store price tags using Flipper Zero

#51

Post by dfxm12 »

kvuj wrote: post #43
Aboutplants wrote: post #29

I was in college when self checkout became a thing and it took us all of about 45 seconds to realize that you could just check everything out as bananas. Steak was weighed and priced at 4011 (banana code) as the stoned teenager cashier paid no attention. Everything on the receipt was literally Bananas

People like you are why we are living in an increasingly lower trust society, with for example having items behind locked door in shops. Reminds me a bit of the shopping cart theory.

Think about blaming the grocery store replacing workers with no one in particular before you blame some college pranksters.

Grocery stores in general consolidating, laying off workers, leaving them without pay/benefits, taking advantage of greedflation, etc., is a bigger drain on society.

Re: Edit store price tags using Flipper Zero

#52

Post by manarth »

junon wrote: post #47
manarth wrote: post #39

Earlier quoted context omitted.

Most self-checkouts I've come across have weight validation – "Unexpected item in the bagging area". Categorising things as "bananas" tricks the checkout into accepting the weight of an item, and you pay the appropriate price per bananagram.

This is a more expensive form of shoplifting though, idk why even bother with the banana thing, as hilarious as it is.

Presumably there's a slightly lower risk of getting caught, as casual observation suggests a normal shopper paying for their groceries.

Re: Edit store price tags using Flipper Zero

#53

Post by tamimio »

Aboutplants wrote: post #29

I was in college when self checkout became a thing and it took us all of about 45 seconds to realize that you could just check everything out as bananas. Steak was weighed and priced at 4011 (banana code) as the stoned teenager cashier paid no attention. Everything on the receipt was literally Bananas

Careful, the law is lenient if you steal from other normal people, but as soon as you steal from the wealthy, try to fraud them, you will see all sort of laws to make sure you are an example to others so they never think about doing the same, but a normal person? Oh well, you should have paid for insurance, or suck it up.

On the other hand, the wealthy can lobby, inflate the prices overnight just because, while also reducing the good weight aka double increase, and you can’t say anything because it’s legal!! It’s a one way “justice” system.

Re: Edit store price tags using Flipper Zero

#54

Post by teeray »

rickdeckard wrote: post #10
weli wrote: post #8

This is pretty dangerous. At least in my country the displayed price must be honored and they cannot refuse the sale.

Usually the advertised price must be honored, because it may have brought the customer to your store. For prices displayed on the shelf-label inside the store the law is usually not that strict (YMMV), as a shop-owner can refuse sale on check-out (otherwise I could put a pricetag on e.g. a shopping-basket and the shop-owner would be legally required to sell me the basket...). Besides, most shops I've seen (in Europe)…

It definitely varies by jurisdiction, but the register price always loses to any printed price in the US states I’ve lived in. This is a protection since retailers have used pricing mistakes to unfairly profit. Watch your receipt like a hawk at the dollar store[0]

[0] https://www.theguardian.com/us-news/2025/dec/03/customers-pa...

Re: Edit store price tags using Flipper Zero

#55

Post by petterroea »

It's always funny when people publish source code and have a disclaimer saying "You CANNOT use it for bad!". When is the last time a criminal read such a disclaimer and thought "Oh right, guess this isn't for me"?

Sure, at least the developer can say they did say so, but it doesn't matter. To me it seems more like avoiding responsibility. You published the tool, and by doing so you changed the world, even minutely, and in ways you cannot predict.

As hackers we bear the responsibility of tools we publish. Even if you believe knowledge is the most important and that everything _should_ be published, we should at least be well aware of the consequences. Great power, great responsibility.

Re: Edit store price tags using Flipper Zero

#56

Post by stevekemp »

rimunroe wrote: post #22
rickdeckard wrote: post #10

Earlier quoted context omitted.

Usually the advertised price must be honored, because it may have brought the customer to your store. For prices displayed on the shelf-label inside the store the law is usually not that strict (YMMV), as a shop-owner can refuse sale on check-out (otherwise I could put a pricetag on e.g. a shopping-basket and the shop-owner would be legally required to sell me the basket...). Besides, most shops I've seen (in Europe)…

> Usually the advertised price must be honored, because it may have brought the customer to your store. This is not the case for groceries in Massachusetts at least. If there’s a discrepancy between the tag’s price and the scanned price the store must charge the customer the lowest of the two: https://www.mass.gov/price-accuracy-information

I recently learned that in some cases fines of mispriced goods were very low, leading to companies repeatedly failing tests - and over/undercharging their customers.

https://www.theguardian.com/us-news/2025/dec/03/customers-pa...

That seems shocking to me, but I guess I live in a country where the prices on the shelves are "final" (with no need to add taxes) and I think it would be immediately obvious if I'd been charged the wrong price for goods.

Re: Edit store price tags using Flipper Zero

#57

Post by tamimio »

voidUpdate wrote: post #2

I still don't think I've seen an actually useful application for a Flipper Zero. It's all just "use this to change store price tags" or "here's how to disconnect all bluetooth devices", but also "don't actually use this, because it would be illegal, this is just for educational purposes"

It’s been very useful to me in so many ways, from fob management, to one IR, to rf scanner and other stuff, it’s useful if it fits your needs, just like anything else out there.

Re: Edit store price tags using Flipper Zero

#58

Post by mtlmtlmtlmtl »

Aboutplants wrote: post #29

I was in college when self checkout became a thing and it took us all of about 45 seconds to realize that you could just check everything out as bananas. Steak was weighed and priced at 4011 (banana code) as the stoned teenager cashier paid no attention. Everything on the receipt was literally Bananas

At least here, there are randomly triggered checks by shop staff where they have to manually rescan anything before they let you leave. And possibly, those checks are more easily triggered if you do certain very strange things like buying nothing but many separate instances of "bananas' with widely varying weights. Wouldn't be too hard to program a set of rules for the most obvious red flags.

And of course, the area is wide open and well covered by cameras, and usually self-checkout means paying by card or google pay or something, which will tie your identity to the purchase.

Re: Edit store price tags using Flipper Zero

#59

Post by hughNala »

voidUpdate wrote: post #2

I still don't think I've seen an actually useful application for a Flipper Zero. It's all just "use this to change store price tags" or "here's how to disconnect all bluetooth devices", but also "don't actually use this, because it would be illegal, this is just for educational purposes"

You just aren't being creative enough, I use mine daily:

1. TOTP generator

2. As an extra garage door opener to let guests in from my desk

3. To avoid typing my long WiFi password in while setting stuff up (ducky or qr code)

4. Wrote a custom app that suggests meals/ restaurants so when the wife asks what we should eat this week I can just rattle off the random suggestions

Not to mention other random things on a less often basis

Re: Edit store price tags using Flipper Zero

#60

Post by hnburnsy »

shrubble wrote: post #48
Aboutplants wrote: post #29

I was in college when self checkout became a thing and it took us all of about 45 seconds to realize that you could just check everything out as bananas. Steak was weighed and priced at 4011 (banana code) as the stoned teenager cashier paid no attention. Everything on the receipt was literally Bananas

I saw a video where someone took banana bar code stickers wrapped around a bunch of bananas and put them on the TVs in their shopping cart and then checked out via self checkout. I predict that self checkout will only remain in the more trustworthy areas…

That video was staged, at Target electronics need to be paid for in the electronics department where there is no self-check out. In addition Target has the best Loss Prevention in the business, including let shoplifters continue until they accumulate enough goods that their crime is a felony.
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