yashsingh1/xdaforums huggingface dataset:
[Realme C21] smiley.raver:
Yes the phone is dual Sim variant , just need to buy dual Sim card tray or if inpatient, and a steady hand, just cut the Sim card holder for second Sim out.
[Realme C21] smiley.raver:
The Australia prepaid Optus has both dual Sim and nfc
[Realme C21] PhotonIce:
Sorry if this is a dumb question, but why the heck would they cover up a second sim slot if available? Isn't a second sim slot better for their marketing of the device? Wouldn't the device show up as dual sim in the about phone section of settings, despite only having one usabale slot? It doesn't sound like a smart thing to do.

They're also wasting that "precious" in-phone space, not to mention the manufacturing costs to make a dual sim model (which is single sim), only to sell it for the same or less than an actual dual sim model with a usable second sim slot.

Usually what they do is they remove the second slot to make room for the nfc module. That's why you don't often see dual sim phones with nfc in the budget/mid range, it's either one or the other.
[Realme C21] smiley.raver:
Mate, completely agree, but you need to ask mtk/Oppo/realme

The only explanation I can think is, that in Australia, it is extremely rare to be able to buy dual Sim straight off the shelf, usually havego order in(from my experience abut that could also just be Sony phones as well) only my second realme and the C3 that I had before this phone was exactly same

Again, question needs to be asked off manufactures lol

I can only tell you what is and what can be done, as I modified the Sim card tray as stated and put Sim In and there you go.
[Realme C21] PhotonIce:
Wow. I thought that they might disable dual sim since the model is a "single sim" one, despite it having the hardware capabilities.
[Realme C21] Blank tape:
It is disabled in Australian firmware. That is not surprising for a carrier locked model for obvious reasons but what is somewhat surprising is that the carrier unlocked Australian version which seems to be only sold online direct from realme is also the same model at the same RRP. I think it might be realme's only single SIM model sold in AU. I suspect you might lose NFC if you install dual SIM firmware on it but smiley.raver would know for sure.

I can only speculate that since Australia is a relatively small market it is not worth the effort of manufacturing a special hardware variant for it. OTOH, if that is true that suggests the model might have latent NFC characteristics in other markets which seems a bit of a stretch, so it maybe that it is harder to subtract the 2nd SIM contacts than add NFC. TBH, for such a low power CPU its a bit surprising to see NFC anyway but Optus would only care about the end result for the cheapest cost and maybe the different firmware and modified SIM tray is the cheapest manufacturing option.
[Realme C21] smiley.raver:
As attached. Wish I had some spare tags lying around to show working but screenshot is best J can do lol
[Realme C21] Blank tape:
What combo of region and firmware are you using or other magic? It's interesting that the firmware you are using has auto-detected either the 2nd SIM or NFC when that combination is not sold in any region.
[Realme C21] TheTrapdoor:
Also interested in knowing how to use a second Sim. Out of curiosity I modified the Sim tray, but the 2nd Sim was not detected. Android 11, rmx3201AU_11_C.09
[Realme C21] Blank tape:
If you search the Oppo threads you can find the odd guide on changing the region for example this thread I don't know whether that is sufficient and if its is whether the mix of Australian firmware and different region causes a problem with future updates. I'm lead to believe that changing the region via the process in the linked thread is not possible with Android 11 or at least after some particular update on Android 11. If changing the firmware is required I don't know whether there is a suitable image that will flash itself but there are programs that will do that e.g. mtkclient.

Hopefully, smiley.raver will comes back and provide some more pointers or maybe you will if you're braver and less patient than me.

Good luck!
[Realme C21] TheTrapdoor:
Just an update, phone automatically updated with rmx3201_11_C.11 but still only detects one Sim.
[Realme C21] Blank tape:
It won't happen by itself. You need to change the region code and/or install firmware from another region to have the 2nd SIM detected. If you need to rollback to Android 10 so you can change the region code there is a link to a rollback package in the post introducing realme UI 2.0 / Android 11 on the (Indian) realme community site. If you can't find it let me know and I'll have a look later.
[Realme C21] smiley.raver:
Yes you will need to roll back to adtod 10, to change region for firmware, as I said in running Australia Optus prepaid region and I get the updates as well as the dual Sim and nfc(if you need a quick way to test of nfc works use a bank card with a chip on it , turn nfc on and putghw card near the phone, phone will either do nothing or say no process to view the data or something along those lines which means it has recognised a nfc device near it.
[Realme C21] Blank tape:
I'm not sure I was able to parse that properly. Which region did you change to? Are you saying that you didn't reflash the Optus firmware and continue to receive updates?
[Realme C21] smiley.raver:
Just used the region changing method, selected the Australia Optus prepaid, , phone restarts no data lost.

Done on 2 c21 phones, both have working nfc and 2nd Sim.

I will back up my other 'testing' c21 and try make short video to show it all working,

Region changing in android 11 requires god like access it seems to access that same section, there is probably a way to do it. But just easier to roll back to android 10, change region, reflash you backup, then wipe (this is only if already upgraded to 11, that there is a data loss) mdc, usereata, metadata and then you will be on working android 11, dual Sim, and nfc

I will see if I can find an old sim card, and uploaded short video with both those features working, the 2 c21 phones I have were also brought from different supply chains as well
[Realme C21] Blank tape:
Excuse my density, but I would have assumed that would be the region the phone ships with.

Don't do a video just for me. I never watch them, but I wouldn't mind reading your comments on one of the existing guides about any gotchas or steps that can be eliminated. I don't really understand what the software is doing apart from enabling the region change and possibly other codes. Would be good if there was an open source version of the tool.

BTW, according to a post on OzBargain there seem to be 2 versions or perhaps production runs of the Optus C21. The later one has a screen protector applied and there is no carrier lock. Looks like even the one realme sells directly is also (Optus?) locked as their web site changed recently to state they woud supply an unlock code with the phone.
[Realme C21] smiley.raver:
You have to remember that the firmware also carries with it certain carrier additional software and capabilities that other carriers don't . Go in and get to the firmware region selector screen(don't worry you can back out and no select anything) without any issues, and you will see the numerous amount of regional options.

There is about 10 Australia from memory, ranging from no Carrier, through to postpaid for both Optus and Telstra(possibles Voda) but cant remember off the top of my head.

But the Optus prepaid is the one that seem to get the ota updates where the others didn't the duel Sim was added extra for my needs and the knowledge i can pass on.

In terms of the backend that enables or disables this function is that of unknown origins to me as I haven't had a need to look into why lol

In saying that carries do allow dual Sim variants but usually only on company plans where employee used work phone and personal in one but with the seperate phone numbers. Some people liked dual Sim, I personally am a fence sitter due to 9/10 I forget to change Sim for calling or messaging. Others are just against bevause have no hope I'm hell of remember o change sim everytime and with the price of phones,just as cheap to have two.

I only have two as thought had made a paperweight by then managed to find out pretty hard to brick these things lol

Video would also be for others that are a visual learner and may not fully understand the instructions ;) win for all parties and then also puts an end to me saying it does to one person saying it doesn't.

I honestly don't know where the code is changed for it. And once you have a rooted phone maybe you will find the answer :)

The video isn't hard work it's either do nothing while waiting on new fortnight round or being revived or just hi record and run through 5mins of work that helps everyone

Can I say will work on every c21.....No I can't. I am just passing on what I have done to have it working
[Realme C21] Blank tape:
That's interesting. Seems like wishful thinking on the part of realme.

You've confused me. Are you saying that I can't have both OTA updates and dual SIM or that there is an Optus prepaid dual SIM region?

I think I've only seen one prepaid phone ever that was dual SIM back when Boost was on Optus if I recall correctly. I expect they network locked both SIM slots. It's only now with eSIMs that carriers have offered dual SIM models.

This is the first time I've ever had a phone capable of dual SIM (given some work). It just seems that is would be more convenient than physically swapping SIMs or carrying two phones around. However, that's not without its problems as calling or texting people you know using a different number particularly one that might be temporary just causes problems. One disadvantage of the majority of dual SIM phones is that they are dual SIM dual standby so 2 single SIM phones have an advantage.

Often cheaper to have two with the phones I look at.

Hey, no judgement. I reckon a spare might be handy if you want to use the phone as a daily driver.

Sure, I just didn't want you to go to any effort on my account. As for my questions I'm just trying to learn from your experience and avoid undesirable consequences down the track.

I appreciate your responses.
[Realme C21] smiley.raver:
Mate as you read from my earlier post, it's a weird combination of 2nd Sim V NFC , yet that's the fact of just that particular firmware region that best of both worlds of 2nd Sim & NFC

I found most other regions offered 2nd Sim & assuming the nfc (it isn't something I was really looking at while trying to get phone working and breaking and working again lol)

But yes ota updates for that particular Australia region seemed to get the android 11 ota updates and the others didn't (or not immediately but those regions I was using to test, and had started (but lost the HDD that All the data was on) and try to find a missing link for the fast boot issue for android 11 by using mtkclient to unlock Bootloader in android 10.

So it was more just as research and seeing if maybe one of the varients allowed that fastboot feature to still remain after upgrading from 10 to 11, and then stumbled across this post.

So in terms of being in the dark about it, and being vague but it was more of just the something I had noticed on my phone, that answered the OP's question :)

But ask away and I will continue to answer to best of my ability :)
[Realme C21] Blank tape:
It doesn't make sense that any Optus prepaid region should enable the 2nd SIM. Anyway, I'll suck it and see. Would be interesting to learn if the phones from other markets gain NFC with the same region set.

I'm not too fussed about having NFC. If I was certain there was a sufficient advantage from a different region/firmware I think I'd go for that.

Not that I have a use for it yet but I found I couldn't bring up fastboot with power+volume up on Android 10. Is there some magic required?

I also had some authorisation error when running adb with the phone in recovery mode but happily I could still uninstall apps with the phone fully booted.

That OP would be me.

Have I asked about the exact region name you used? ;-)

Thanks, smiley.
[Realme C21] smiley.raver:
Yeah the firmware is just any of the android 10, I was using a.53 then ota straight to android 11

Fastboot only available after unlocking bootloader

And the region is in that region changing link, you get to the the screen after *#391* and then it's called Optus AU PREPAID or AU Optus prepaid If you can get to that screen and post images of the au prepaid options will be able to give you an exact answer just saves me having to go back to android 10 to give you the exact name.

Yeah adb in recovery will either require TWRP or custom recovery (which require unlocked bootloader)

Pretty sure the nfc chip in these phones iz in middle of phone or under the fingerprint sensor about halfway up phone ) as had my key card no where near the Sim card try and it picked it up so give it a go play around, best way to learn what phone is and isn't capable of :)
[Realme C21] Blank tape:
Damn, I think I've left my region changing too late. Looking at some pcaps, the domain names i.feedback.coloros.com and i.feedback.foreign.coloros.com no longer return an IP so it seems the Oppo servers that Sec5 uses no longer exist under that name. Is there another method?
[G1 Android Development] stephen.n.nikki:
So if we used a symbolic link to store data/app and data/data on the sdcard instead of our phones, what would be the potential risk if we removed the sdcard after having done this? Would our phone go crazy and blow up or what? Would this not solve the problems of apps being stored on the phone's internal memory?
[G1 Android Development] neerhaj:
theres a discussion going on here
[G1 Android Development] Stericson:
Thanks.

One of the users on that forum said that a symbolic link would simply duplicate the information...is that correct?
[G1 Android Development] neoobs:
unless this phone changes the way a symbolic link works that user is incorrect... Think of it like shortcuts on your desktop... it doesn't create a new program to display the shortcut... it just is a small file that tells the computer to run the real program. You could do the same but there needs to be a lot more work than just that. Basically the app is stored in data/app and the data is stored in data/data but then there are other files the program may have installed elsewhere and links may need to be done to quite a few different folders. Basically it will be messy... someone needs to make an app that installs to the sdcard
[G1 Android Development] Stericson:
Ok, I thought he was wrong but I was just making sure....Do you know where the android market is storing all of its cache because the app is growing on my phone and I want to

A) reduce it by clearing the data

or

B) use a symlink to stop it from taking up space on my phone.
[G1 Android Development] neoobs:
if I am not mistaken cache is in data/cache... I know that the /cache directory is a symlink to somewhere else. Forgot where thou.
[Android Stick & Console Computers General] Budman333:
Did anyone get this box rooted or did they find a good firmware that is rooted and remote works with it and is not in safe mode.
[Android Stick & Console Computers General] Barkuti:
If still interested in this, please head over here: https://xdaforums.com/t/rk3566-rk3568-tv-boxes-twrp-rooting-and-etcetera.4562613/
[Xiaomi 12 Pro] BigJohn0:
Hello

Does anyone know the well-functioning GCam for Xiaomi 12 Pro?

Good config is welcome.

(PL - Witam Czy ktoś zna dobrze działający GCam do Xiaomi 12 Pro? Dobra konfiguracja jest mile widziana.)
[Xiaomi 12 Pro] rock'n'rolla85:
There is no dedicated app or config file for Xiaomi 12 Pro. We need to wait.

Try Gcam from BSG or any new version from other modder, it works but photos are not better than from Xiaomi app.

PL - nie ma i chuj xD
[Xiaomi 12 Pro] BigJohn0:
Really? Go, go developers ;-)

PL - Szkoda... Trzymaj się hehe.
[Xiaomi 12 Pro] Manwex:
GCam: https://www.celsoazevedo.com/files/android/google-camera/dev-mtsl/f/dl8/

Config attached (Ported base from 11U)
[Xiaomi 12 Pro] BigJohn0:
Thank you, I'll be testing soon.
[Xiaomi 12 Pro] BigJohn0:
Hmmm.... Ugly.

B&W very stupid, photos yellow and green...
[Xiaomi 12 Pro] Manwex:
Have you imported the config properly?

With this XML, i get 2x more detail and less noise compared to stock.
[Xiaomi 12 Pro] tinhopvh:
Selfie has improved a lot, thanks for the file, I was already extremely sad about the stock selfie.
[Xiaomi 12 Pro] Aresias:
Thanks for the config file i just installed Gcam and this file. I have to say this is night and day compared to the stock Xiaomi camera app.

There are far more small fine details on Gcam that are completly gone on stock Xiaomi camera app.

the only thing that disappoints me about Gcam is that you can't record in HEIC. But you can record in RAW. Does anyone know of an APP to convert RAW to HEIC?
[Xiaomi 12 Pro] Aresias:
Just some tests :

Low light condition, 2 photos taken with 2s interval only.

This is a screenshot that have been taken and cropped the same way on both pictures.

Xiaomi :

View attachment 5686333

Gcam :

View attachment 5686337
[Xiaomi 12 Pro] NOSS8:
Can you post a pic of the coin?
[Xiaomi 12 Pro] Aresias:
what ? what do you mean ?
[Xiaomi 12 Pro] NOSS8:
I have no banknote to compare, only coins.
[Xiaomi 12 Pro] Big Dumb Object:
Try the Parrot's one (the up-to-date versions can be found in the Telegram chanel). From my experience, his mods are the most polished and well balanced.
[Xiaomi 12 Pro] Aresias:
Thanks but this is not in english :)

wich config file to use with this one for Xiaomi 12 Pro ?
[Xiaomi 12 Pro] Big Dumb Object:
One of the advantages of Parrot's mods is that they usually work well without model-specific configs.
[Xiaomi 12 Pro] NOSS8:
Like that:

View attachment 5686403​
[Xiaomi 12 Pro] Aresias:
Some people on the comments on Telegram are saying not working with Xiaomi i don't know why.

I actually downloaded and tested the latest version of the telegram chanel you have provided and i've got very bad results it's even worst than Xiaomi i got less details.

So i reinstalled the version that was provided at the start of this thread.
[Xiaomi 12 Pro] Dayuser:
Did you change any settings in Parrot v1.4 gcam?
[Xiaomi 12 Pro] Aresias:
No i just properly uninstalled the MTSL version and manually deleted some remining folders before installing the Parrot version.

But i didn't change any settings with the Parrot version when i tried it.

If someone find a way to actually obtain good results with the Parrot version please let us know.
[OnePlus 9 Pro] bengoodall.raw:
Hey! I'm currently trying to flash a custom rom on my 9 pro from 11.2.10.10 and i've unlocked the bootloader. ADB commans are working fine, but as soon as I boot into the bootloader and type "fastboot flash boot "recovery.img"" it just doesn't do anything, no "downloading..." text or anything. I then tried to use any other fastboot commands and nothing works, (to be clear, my device is being recognized, "fastboot devices" does show my device. but no other command works, either doesn't do anything, or gives me an error.

any help would be much appreciated :)
[OnePlus 9 Pro] GabrielSousa:
check if you have the last fastboot version - platform-tools_r33.0.1
[OnePlus 9 Pro] razercortex:
Have you checked Device Manager to see if there's any unknown devices?
[OnePlus 9 Pro] CZ Eddie:
Assuming you're using the latest adb & fastboot versions, what happens when you type "fastboot devices"? Does it show your device?
[OnePlus 9 Pro] bengoodall.raw:
Yep, shows my device
[OnePlus 9 Pro] bengoodall.raw:
Sometimes it does but when I unplug then replug it shows adb bootloader interface
[OnePlus 9 Pro] bengoodall.raw:
Yep I have the latest version
[OnePlus 9 Pro] CZ Eddie:
Does it work with ANY fastboot commands at all?

Such as "fastboot reboot"?
[OnePlus 9 Pro] razercortex:
Try running those commands on another PC and let us know if it works.
[OnePlus 9 Pro] bengoodall.raw:
Nope, that doesn't work either
[OnePlus 9 Pro] bengoodall.raw:
Didn't work either 🫤
[OnePlus 9 Pro] CZ Eddie:
Screenshot of the error?
[OnePlus 9 Pro] GloriamSemper:
I had similar issues and found out it was because I was executing the commands in the bootloader instead of fastbootd mode. Try running them in fastbootd mode instead?
[OnePlus 9 Pro] JohnTheFarm3r:
Ermm, you're SUPPOSED to run the commands in "bootloader" mode, not fastbootD mode.
[OnePlus 9 Pro] JohnTheFarm3r:
I'm kind of curious how unlocking the bootloader worked but using other commands doesn't.
[OnePlus 9 Pro] GloriamSemper:
I know wierd, right? None the less, certain fastboot commands were only successful for my 2127 in fastbootd
[Xiaomi Redmi 5 Questions & Answers] Roudero:
So I tried installing custom rom lineage os 19.1 . Everything was going flawlessly like from unlocking to installing GApps . Then when I tried to reboot system i was stuck at at lineage logo booting . I stays stuck for like 5 minutes then again reboots. I tried the whole process again and again and again (wiping the cache,system etc. to installing GApps) and all the 3 times it installs without any error but at the time i try to reboot system its the same old story. It gets stuck for 5mins and then again reboot and again gets stuck for 5min and again the same thing. So I thought about flashing through mi flash tool and idiot me pulled of the usb cable at the middle of flashing thinking it ended (Wasnt showing success in result) so it booted but right after setting up pops out, the phone again reboots . So I again went on trying to flash the device through mi flash tool and now it shows "Error writing in partition ; Critical Partition Flashing is not allowed" . Then I tried to unlock via cmd as i cant access to mi unlock (I had to login via QR code when i was unlocking and i had to the same so i couldnt), so as i try to unlock via cmd it says "token verify failed" . I cant even go to EDL mode . I dont mind on losing data I just want to keep it alive somehow. Any helps would be appreciated TIA !

I also tried different flash tool (older ones) but it didnt work
[Xiaomi Redmi 5 Questions & Answers] NajarPro:
Yeah, same story for me. Looking for an answer too
[Xiaomi Redmi 5 Questions & Answers] angshuman_sarkar:
I was facing same problem. so i gave it to local phone repair shop. they solved it perfectly.
[Xiaomi Redmi 5 Questions & Answers] spoidermox:
can you tell us what local repair shop done with phone? i also gave to local repair shop they said it cant be repaired!
[Xiaomi Redmi 5 Questions & Answers] spoidermox:
same thing hapannig with me . is it your issue fixed if tell me how ?
[Touch Diamond, MDA Compact IV Accessories] Besk:
Howdy,

I have the LM-958-BLK BT-watch connected

to my HTC Touch Diamond P3700.

- When making a call there is no sound,

untill the person answer!!!

- IT will not present any SMS?

http://www.lm-technologies.com/ci/index.php?/products/downloadpdf/LM958_Datasheet.pdf
[Samsung Galaxy Note 9 Questions & Answers] Dougmeister:
I recently installed Noble ROM 2.2 and love it. However, from time to time I can't send or receive text messages.

Now, I can't pinpoint exactly when this happens. I usually notice it when an SMS (not MMS) sits there trying to send and I get an error:

"Currently unable to send your message. It will be sent when the service becomes available."

However, I have two (2) bars of cell service and can make/send calls just fine.

One of two things seems to "jog" the messages into sending/receiving:

1) rebooting the phone, or

2) making a phone call (I just noticed this for the first time today)

Any ideas?

I don't think it is the ROM. I am using Ting (T-mobile SIM card), which Ting just replaced in case that was the problem. Thanks.