Some time ago, I planned to pick up a second-hand Sony XZ1 to play with. Snapdragon 835+4+64, dual speakers+Sony's wide color range LCD, and the average price was about 500 yuan. It just happened that there was a Bilibili card that could not be inserted. Let's take a video to make money.

In fact, the price of Taobao dealers is the same as that of idle fish garbage men. You can just pick an individual seller of idle fish in the same province and place an order. (I think it's faster in the same province)

Simply communicate the price, The seller proposed express delivery Anyway, the express fee was not much, so I agreed.

In a word, there are nearly 100 orders for idle fish to buy and sell things (just a simple garbage guy). The other party can understand the request for payment on delivery. Our own words are OK, but the price of SF is the same anyway. Some receptionists don't seem to like orders sent by mail. Maybe it's too troublesome to collect the money. It's also possible that the package service fee of 1 yuan will be charged more when the goods are received. We usually don't collect the goods sent by mail.

There seems to be no problem until we receive the goods:

Generally speaking, except for fragile products, we don't open the box in person, so do everyone. The couriers don't like your trouble, so do you. In addition, Taobao/JD.com both have relatively perfect buyer protection mechanisms, and it seems that whether the goods are inspected in person or not has no critical impact. (Be careful whenever you want)

I found a problem when I got home to receive the goods:

Airtight

Seller's mobile phone It's not airtight at all When pressing, the pressure even becomes negative 😂😂😂。

(The idle fish equipment is shown on the left and the comparison equipment is shown on the right, see the description below)

It was originally "mountain climbing", but life and death became "electrocardiogram".

For Sony's air tightness, we should pay attention to $ Delta mathbf {p} $. Sony's machine is equipped with a pressure sensor inside, and Sony supports full body waterproof, so the inside of the machine is isolated from the outside.

When you tap the screen, the pressure will rise due to external pressure. Generally speaking, the machine with good air tightness should be $10 leq Delta mathbf {p} leq 100 hPa $. When $ Delta mathbf {p} leq 5hPa $, the waterproof is basically unavailable.

Suppose that our "ECG" is a periodic function (we press it evenly), and 898 hPa is the x-axis.

Let's take a look at the idle fish:

In a cycle, the pressure of the positive half axis of the y-axis decreases after a short rise, but I don't let go. It is speculated that the press type causes the process that the air pressure inside the machine is higher than the external air pressure for a short time, but as the air is discharged, the air pressure is balanced.

When I look back at the negative half axis of the y-axis, this part appears when I release my finger. It is speculated that the plastic deformation rebound of the fuselage caused the process of temporary negative pressure inside the fuselage. With the entry of air, the pressure returned to balance again.

Easy to get by observation: $ Delta mathbf {p}_ \mathbf{y}^+ < \Delta \mathbf {p}_ \Mathbf {y} ^ - $, if you continue to guess, it is because part of the gas during pressing is discharged out of the fuselage with pressing, and does not act on the pressure sensor.

Even if the XZ1 is out of date, it is also a Snapdragon 835 machine. It is impossible to be airtight even if it is aged normally today. So The only reasonable explanation is that the machine has been disassembled 。

With the deepening of our investigation (it is recommended to cooperate with Conan BGM, Reasoning (オ リ ジ ナ ル ヴ ァ ー ジ ョ ン) ）

receiver

(The idle fish equipment is shown on the left and the comparison equipment is shown on the right)

The color of Sony XZ1's earphone network should match the color of the body, but the seller's earphone network is black.

theme

Look back at Xperia ™ Loops, a feature of Sony is that the desktop color of each mobile phone is corresponding to the mobile phone by default (although it seems that other manufacturers are also like this)

(The idle fish equipment is shown on the left and the comparison equipment is shown on the right)

Another question is that the seller sells a rare "Hong Kong version single card". Whether there is a Hong Kong version single card is still a mystery. We use the Sony firmware downloader XperiFirm to view all the XZ1 firmware for analysis.

model

Xperia XZ1 is divided into two versions, namely G8341 (single card) and G8342 (dual card), except for the special customized version. The firmware list of G8341 does not show mainland and Hong Kong, but only G8342 shows mainland and Hong Kong.

Then we can conclude that Hong Kong has never sold the so-called "Hong Kong version single card XZ1"

So is our mobile phone the Hong Kong version? We also need decisive evidence.

Frequency band

We know that every mobile phone has a unique IMEI serial number (except Huaqiang Beiyao).

In order to ensure that there is no problem with the signal of the equipment, manufacturers generally have some differences in the frequency bands of the equipment sold for different regions.

Here we need to query the IMEI database to confirm. We query the GSMA database by technical (RMB) means:

Compared with the G8342, the mobile phone of the idle fish seller lacks B32 and has more B25 bands.

If you know something about communication, you will know, At present, only Sprint in the United States is using B25 band 。

For the Japanese version, there are more B41 bands, corresponding to KDDI and Softbank in Japan (China Mobile also uses B41), and less B2 and other bands (no operators in Japan use B2).

The case can be solved after seeing here (it is recommended to cooperate with Conan BGM, To resolve the problem ）

The original color of this mobile phone should be black, which can be judged by the earpiece color and the default theme. For various reasons, it has been renovated into a pink "8 new" machine.

The original sales place of the machine should be the United States and other countries, and the prototype number should be G8341.

Therefore, the seller sold us a refurbished machine with a European or American version (G8341) black refurbished into pink as a "Hong Kong version single card pink" second mobile phone.

And then with the seller The middle door is sniped (crossed) 。

refund

(It is recommended to cooperate with Conan BGM, "Famous Detective コナン"~メインーマ (バラードヴァーㄜョン) ）

After we contacted the seller and expressed our intention to refund, the seller didn't log in to the idle fish client directly. Maybe he was busy feeding ostriches and didn't have time to watch it.

This does not affect our application for refund. After filling in the refund application, it was delayed until the refund timeout. Then it is the default address. Remember what we mentioned earlier, when the seller sent it, the freight was paid on arrival. Because the refund amount of the order cannot exceed the total amount of the order, we decided to bear the one-way freight for humanitarian reasons (in fact, we didn't have time to quarrel over a dozen yuan), and returned the goods to the other party in the form of payment.

The news from the seller returned slowly, but it was faster to refuse the refund. I refused my refund application in the morning of the day when I signed for it. The so-called "influence secondary sales" of the reason.

Because the evidence is complete, directly apply for customer service intervention. It is reasonable to say that people who get refunds usually go straight to the Xiaoyuxiao Court. This time, for the first time, they met the Xiaoyuxiao waiter.

Rollover

The waiter directly ruled that the seller's evidence was invalid, but the refund should deduct the freight incurred when we returned it, and the remaining amount should be returned directly.

That is, I have to bear the round-trip freight. In principle, if it is a consumer fraud, the seller should bear the round-trip freight. For example, Taobao and relevant national laws and regulations are also determined in this way. The idle fish is not a business transaction. According to the waiter, it should be handled according to the "idle fish community transaction dispute handling norms". Let's see:

Chapter III Dispute Settlement, Section I Basic Principles:

Article 20 Freight dispute: When the transaction is handled as a return and refund, the seller shall bear the shipping freight, The buyer shall bear the return freight (unless it is the seller's responsibility) , if both parties agree otherwise, their agreement shall prevail.

Risk warning:

1. If both parties fail to reach an agreement and unilaterally deliver the goods or use the mail to collect payment, the recipient has reason to refuse to sign, and the sender bears the risk of refusing to sign.

2. After the intervention of idle fish, if the party that should bear the freight fails to perform, idle fish will make a disposition in violation of the transaction agreement according to the actual situation.

Friends familiar with Taobao/Leisure Fish may know:

After the return refund application is approved (whether it is actively approved or dragged to the system for compulsory approval), you need to ship the goods and fill in the waybill number within 7 days, or the refund application will be canceled.

If the seller does not reply/agree to pay the freight, You can only choose to send by mail, otherwise the seller has the right to refuse 。 However, you can only ask idle fish to "handle the breach of trading agreement" afterwards.

At present, we don't know what is called "disposal of breach of transaction agreement", because we haven't contacted idle fish customer service. However, there is a high probability that this time it will be a net loss of 50 yuan for freight.

I finally got a refund of 532 yuan. I spent time arguing with idle fish for dozens of yuan. It was far from worthwhile to calculate the time cost, so I directly agreed with the waiter to deduct the freight.

tail

Later, we placed an order on Taobao. The "99 New" Japanese version of 550 CNY has no bumps on the body, no scratches on the screen, and even the oil drainage layer is intact. In a word, if you don't need to unlock the Bootloader, there seems to be no difference between the Japanese version and the European version. All the software that comes with the Japanese version can be uninstalled or disabled. If you take a few minutes to disable it, the software that comes with the Japanese version will be the same as the European version.

Fortunately, we didn't lose much freight this time. I learned a lesson in advance and read the "Free Fish Convention" for such a long time. At that time, we didn't seem to have so many things to do when we used free fish.

The experience of XZ1 is already being written.