Ota update files

[Android Central Question]

Ok so this is whats happening i am going to start from the beginng i have a tablet that can only be updated via computer usb connect no wifi. It will up date once i connect to the companies server and it detects the device. And then it will send the nessary files to the tablet once i unplug the device about 5 to 10 seconds later a white screen appears for a sslit second and then a black screen with a message saying processing sytem update then 5 to 10 seconds later it says applying package of what ever name is on the file or numbers and then the tablet resets it self and what ever the package/update was in the file is applied to the tablet. Ok this is what i want to know. I was recently. able. To plug the tablet into a computer and see the place the update gose. Theres a folder named omega when i clicked on this folder i could see i guess file and md5 file with the names of the packages the screen showed after i unplugged it from the computer and it said processing system update applying package of what ever name is on the file or numbers. So then i realized that it might be possible to drop the file in that folder the process seemed simlar to OTA just via usb. the md5 file had this name omega_facebook.md5 when i clicked it it had a string of numbers in it i think 32. So i requested another apk from the computer from the company the apk was a game (call jack in the box.1.2.5.apk) it cost 3 dollars i then pulged the device into the computer and once the notification came across the screen downlaod 100 percent. I unplugged the tablet but this time i quickly tunred the device off and pluged it in to a computer and mounted it. I seen the same folder omega i clicked it and this time i was able to see the game i had downloaded only it wasnt an apk it was a zip file with the omega_jack-in-the-box.1.2.5_1342113507478.zip With another file beneath it with the same name but diffrent file ext the file extension was md5. I pulled both files and placed them on my desktop a and turned the tablet on nothing happened. I then had another tablet with the same folder i placed both the zip and md5 file on to that device and unplugged it and the device flashed white momentarily and went to the black screen and sad processing system update applying package of what ever name is on the file. I then told my friend what had happen and he took the tablet and asked if it could be possible to install are own apks and software update through this folder omega folder. So he found some tech guy that told him yes and showed him he and it worked but he wont tell me how he did this. When i was a able to view his tablet i seen that it had only the md5 file left nolonger the zip file with the game name on it but then i started to see files that were not in that folder when i had first seen it they had file extension sh and it was giving some type of instructions. I will send pics.

My question is whwhat is in the zip files of the game that i requested and how can i recreate this same process manually. I know it is possible because the guy has tons of new apps that are not in The app store the company provides. Tell me how he did this please And when i try to zip an apk and apply a md5 file and put the name of the omega first. And unplug it from my computer it then flashes and says processing system update but then the tablet abruptly cuts off and nothing. I turn it on and it did not apply the apk i want. But when i drop the zip file and md5 file of any zip file the company sends it work just not the apps i want. Screenshot_2019-10-03-08-32-55.png

 

[mustang7757]

Hi, welcome!
This is a company tablet ? Why are you trying to mess with it ?
I'll leave a link to communicate here
https://forums.androidcentral.com/showthread.php?t=409154

 

[B. Diddy]

Welcome to Android Central! What tablet is this? I'm guessing it's some direct-from-China device.

 

[hallux]

I think some terms are confused here. OTA usually refers to a device update, the OS. Are you just trying to update a game? Usually an APK can just install on a device if unknown sources is enabled in whatever way it's done on that device (if possible, some don't allow it).

 

[Rukbat]

First, installing apps (or games - same thing) from an iffy site like that is taking a chance.

Second, if it's a Samsung, the file might be a file ending in .tar.md5. That's a .tar file with the md5 hash (you were correct, md5 is 32 characters) added to it. If not, the md5 file is just being sent to verify that you copied the file correctly. (The MD5 hash is the number gotten by hashing every byte in the file, according to the MD5 algorithm, and truncating it at 256 bits each time. When you get the file, the installation package does the same thing, then compares the number it gets to the number in the md5 file. If they're the same, the odds that the file got corrupted are vanishingly small.)

An .apk file is a .zip file with a different extension. You can open it with any app that opens .zip files. To reproduce what you got, just change the name of the .zip file to end in .apk (make sure it has a META-INF folder and an AndroidManifest.xml file in it first). Then download an MD5 app, one that can create md5 files. Create an md5 of the apk file, put it into a text file, name the text file the same as the apk file, but with the extension .md5.

If the .apk file doesn't have those files in it, it's not a standard .apk file, so you'd have to have someone analyze it to find out what it is. (Any good software developer should be able to do that.)

(A file with the extension .sh is a file of instructions for the computer, to be run in a shell [hence the .sh extension], which you can only do from a terminal app in Android - the terminal app puts you into a shell.)