June 2026

One solution to frequent ‘unauthorized: authentication required’ errors when pulling Docker images

02.06.2026 0, ? Software and Hardware Usage

The problem looked like this:

[root@ci1 ~]# docker image pull wzkres/centos-ci-gcc:centos-7-cross-arm64
centos-7-cross-arm64: Pulling from wzkres/centos-ci-gcc
2d473b07cdd5: Already exists 
9d26d6802cad: Pull complete 
90f6d29b7c1a: Pull complete 
7bfff1b24796: Pull complete 
80b3d4546432: Pull complete 
c3a37398e8b3: Pull complete 
3ba42b3a770d: Pull complete 
85b3405c69c4: Downloading 
2ad9c2d42a3d: Waiting 
5f1b06925eb4: Waiting 
4f4fb700ef54: Waiting 
57c257cf6173: Waiting 
787f48d693d2: Waiting 
9f1677804e77: Waiting 
c13fd6dc43b4: Waiting 
80bd40938514: Waiting 
56ba96a89fa8: Waiting 
unauthorized: authentication required

When pulling public images from hub.docker.com, this error occurred randomly but very frequently, making it almost impossible to download larger images. At first I thought it was a network issue, tried different proxies and mirrors, but nothing helped. Since the error mentioned ‘authentication‘, I suspected Docker Hub login problems and tried docker login -u xxxx, but that did not solve it.

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Logcat read failure troubleshooting and fix record

02.06.2026 0, ? Software and Hardware Usage

After flashing lineage-16.0 on a retired OnePlus One, it had been running smoothly as a backup retro gaming device. Recently, when using it for Android debugging, I suddenly found that logcat was not responding. In Android Studio the log window was completely blank. The adb device status was normal, but running adb logcat or adb shell logcat showed the error ‘logcat read failure’.

I spent a long time investigating. I tried various methods. Rooted into /system/bin and confirmed that logd was intact. Some people suggested SELinux issues, so I checked with ls -Z and saw the permissions were u:object_r:logd_exec:s0, which looked fine. I suspected Magisk had broken the system, so I did a factory reset, but the error persisted.

Then I remembered that the system image I used previously was downloaded from some random website, and it came with many preinstalled junk apps. Maybe the ROM author had broken important functionality. So I searched and found an official lineage old version image: https://lineageosroms.com/bacon/#installing-lineageos-from-recovery

After reflashing with the pure official image, logcat worked normally again. Problem solved.

PS2 DS2 H controller 760020 board BU6370AK main chip conductive film replacement and repair

01.06.2026 0, ? Software and Hardware Usage

A friend had two H controllers. One was severely damaged: all buttons except the left and right sticks, L3, and R3 were nonfunctional (because years ago it was soaked in cola…). The other had L1, L2, and D-pad up and left failing, while the rest worked normally. Opening them up:

IMG_0756 IMG_0755
The back cover showed it was an H controller, with the board marked 760020 in white at the top left. This is the second version of the H controller. The conductive film under the button pads was marked 03-0241. On Taobao I found similar films for about 2 RMB each. Observing the connection between the board and the conductive film, I confirmed that the film connector and socket are integrated, with the socket pins soldered directly to the PCB. Comparing with my A controller, its conductive film is pressed directly onto the PCB. Taobao did not sell the original socket type film, but luckily one seller offered a similar 19-pin pluggable socket.
Looking at the PCB traces and referencing information that PS2 DS2 controllers support pressure sensitivity, the conductive film carbon contacts change resistance depending on button pressure, which the BU6370AK main chip converts into digital signals for the console. Examining the film traces, I saw that except for Select, Start, and Analog buttons, all carbon contacts shared one common line, corresponding to pin 9 from the left. Using a multimeter with one probe on pin 9 and the other on each button pin, pressing a button showed resistance changes from 0 to several kΩ (tested on the partially working controller). On the faulty buttons, it was open circuit. Comparing traces, L1, L2, D-pad up, and left corresponded to the leftmost pins, while D-pad down (which worked) was the next pin after left. So I concluded those four buttons had broken traces on the film. The other controller was worse: all buttons failed, only the analog sticks worked. Despite the cola damage, the main chip seemed fine. So I ordered replacement films and sockets from Taobao.

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