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[HELP] Nexus S can't boot recovery

Hi all,
Been given a Nexus S i9023 by my brother who has been "tampering" with it and now it seems a bit messed up.
When booting up - it gets stuck on the "Google" screen with a padlock on it... I can get into fastboot and I can flash recovery but when I attempt to load any recovery - I get that same Google screen with the padlock! I've downloaded a stock rom and even flashed system etc via fastboot but that still gets me nowhere past the damn padlock!!
I've tried to "fastboot boot recovery.img" and I still get the Google screen with the padlock but it says "Fastboot status - OK" on the bottom left.
I've searched and searched but everyone just seems to give tips on how to flash recovery. I know how to flash recovery; it just seem to be going into it though! Could the internal memory be screwed?
Thanks for any advice!

Sounds strange for sure. You try from within the OS? Enable USB debugging and adb reboot recovery.
Doubt it will work but its worth a shot

albundy2010 said:
Sounds strange for sure. You try from within the OS? Enable USB debugging and adb reboot recovery.
Doubt it will work but its worth a shot
Click to expand...
Click to collapse
The phone stops at Google with the padlock on boot! Can't even get into the OS. Going to try to unbrick it and Odin but left my ubuntu laptop at my parents and can't be bothered to go get it... couldn't get it to work booting off cd rom. Kept giving me the "SBL Injection Failure Failed to find device" error booting ubuntu on a CD!

You may have a storage issue.
I seen you tried to flash system and boot recovery with fastboot ( which should have booted) but did you try to flash them all and wipe. The command is fastboot -w update file name.
I think Odin is a windows only tool anyways by the way.

albundy2010 said:
You may have a storage issue.
I seen you tried to flash system and boot recovery with fastboot ( which should have booted) but did you try to flash them all and wipe. The command is fastboot -w update file name.
I think Odin is a windows only tool anyways by the way.
Click to expand...
Click to collapse
No idea why I said Odin - I meant the unbrickable recovery thing.
I tried Odin with a Jig last night; got it into download mode and flashed with odin. Got the same result.
fastboot -w also gives the same issue...
If I have a storage issue - is there any way I can tell?

Basically you can tell by the issues you're having. Doing all the proper stuff to flash images etc and still having a booting/working device.
As far as a actual diagnostic tool I don't know of one. But it sure sounds like a hw issue to me.

I have the following problem: since a few weeks I'm unable to enter recovery.
This is what I do:
- shut down my phone
- press the power button while holding the volume up
- than I get a screen where I can choose from 4 options using the volume controls and selecting an option with the power button
- I select 'Recovery' and press the power button
- I get the usual black screen with Google logo and padlock
- but instead of getting into my recovery, I get a black screen with a Droid lying down, the 'chest' opened and some kind of small warning triangle above it..somebody who knows what I have to do??
Thanks in advance

Pironi90 said:
I have the following problem: since a few weeks I'm unable to enter recovery.
This is what I do:
- shut down my phone
- press the power button while holding the volume up
- than I get a screen where I can choose from 4 options using the volume controls and selecting an option with the power button
- I select 'Recovery' and press the power button
- I get the usual black screen with Google logo and padlock
- but instead of getting into my recovery, I get a black screen with a Droid lying down, the 'chest' opened and some kind of small warning triangle above it..somebody who knows what I have to do??
Thanks in advance
Click to expand...
Click to collapse
Reflash your recovery using fastboot.

polobunny said:
Reflash your recovery using fastboot.
Click to expand...
Click to collapse
And where can I find how to do this? I'm a total newbie for this kind of stuff and I found some hits on google (e.g. http://forum.xda-developers.com/showthread.php?t=1757146) but I'm actually a bit scared to damage my phone or something by doind something wrong or applying some method that's actually made for another device or so.. :s

Pironi90 said:
And where can I find how to do this? I'm a total newbie for this kind of stuff and I found some hits on google (e.g. http://forum.xda-developers.com/showthread.php?t=1757146) but I'm actually a bit scared to damage my phone or something by doind something wrong or applying some method that's actually made for another device or so.. :s
Click to expand...
Click to collapse
Flash custom recovery.img part
http://wiki.cyanogenmod.org/wiki/fastboot#Flash_Custom_Recovery.img
You need ADB (and ADB drivers installed, strongly recommend PDANet Android Drivers) and fastboot executable.
Custom recovery I suggest you use Clockworkmod Recovery.
I imagine your phone is already unlocked?

polobunny said:
I imagine your phone is already unlocked?
Click to expand...
Click to collapse
I think so yes, I could access recovery before if that's what you mean by unlocked

Pironi90 said:
I think so yes, I could access recovery before if that's what you mean by unlocked
Click to expand...
Click to collapse
When u boot on the Google screen on the bottom centre does it have a padlock? If so then it is unlocked.

You are entering recovery. Stock recovery
If you want a custom one either flash with fastboot or if you're rooted with a app. Goo manager. Rom manager etc.
Keep it mind that if you're on a stock ROM the custom recovery gets overwritten back to stock when the phone boots up the os
Q

UselessSniper001 said:
When u boot on the Google screen on the bottom centre does it have a padlock? If so then it is unlocked.
Click to expand...
Click to collapse
Then my phone is unlocked yes

polobunny said:
You need ADB (and ADB drivers installed, strongly recommend PDANet Android Drivers) and fastboot executable.
Custom recovery I suggest you use Clockworkmod Recovery.
I imagine your phone is already unlocked?
Click to expand...
Click to collapse
In installed the drivers and I installed the fastboot executable, but what do I have to do next? If I run the fastboot.exe, it just quickly shows a CMD-window and then disappears.
Edit:
I just discovered that, when I'm at the bootloader (I think it's called that way, the screen where you can select recovery), and I choose to reboot, I get the same 'error' as when I try to enter recovery.
Edit:
Alright, I was able to flash a new recovery, using cmd, but now when I try to enter my recovery, the phone gets stuck at a black screen with Google logo and padlock...

I have same problem as wolverine_2k who made the post. My nexus, can't start, I tried reboot and recovery but didn't work. After reboot or recovery I see Google logo, than Nexus screen and that is it. It didn't move to home screen and it stay with lighting screen all the time till I remove the battery. I can't power off it and don't know what to do. I can't transfer data with my PC (it don't recognize the device - only notice that "unknown device" is connected). Please any ideas?
P.S.: My English is not good, if someone answer do it simple please
Thanks!

[Q] Can't boot, recovery keeps dissapearing

I have searched and tried different things but I'm getting nowhere. I have been running Purity rom on this for a while but when I woke up this morning, I found my screen black and only being able to boot to the bootloader and and google screen (which quickly goes away and goes black again). When I tried to go to recovery at first I believe it was just shutting off. Now it goes to a light black screen.
The first thing I did was flashed the factory image .bat file and everything seemed to go ok but when trying to go to recovery after it went to the light black screen. I turned it off and it booted to the Google screen then off again. Then it booted to the google screen and it froze that way. I can always get it back to the bootloader screen and got it to recovery once by flashing TWRP again using ADB.
TWRP opened once and I tried to do a factory reset but it couldn't find anything and couldn't mount to anything. I got it back to the bootloader again but the recovery has disappeared again. I tried to flash the factory image again but it definitely failed this time.
Please help.

aburn95 said:
I have searched and tried different things but I'm getting nowhere. I have been running Purity rom on this for a while but when I woke up this morning, I found my screen black and only being able to boot to the bootloader and and google screen (which quickly goes away and goes black again). When I tried to go to recovery at first I believe it was just shutting off. Now it goes to a light black screen.
The first thing I did was flashed the factory image .bat file and everything seemed to go ok but when trying to go to recovery after it went to the light black screen. I turned it off and it booted to the Google screen then off again. Then it booted to the google screen and it froze that way. I can always get it back to the bootloader screen and got it to recovery once by flashing TWRP again using ADB.
TWRP opened once and I tried to do a factory reset but it couldn't find anything and couldn't mount to anything. I got it back to the bootloader again but the recovery has disappeared again. I tried to flash the factory image again but it definitely failed this time.
Please help.
Click to expand...
Click to collapse
@bitdomo might be able to help you lol
Might be bad eMMC or something?

when youre flashing recovery, which command are you using.. fastboot boot recovery recoveryname.img or fastboot flash recovery recoveryname.img?

aburn95 said:
I have searched and tried different things but I'm getting nowhere. I have been running Purity rom on this for a while but when I woke up this morning, I found my screen black and only being able to boot to the bootloader and and google screen (which quickly goes away and goes black again). When I tried to go to recovery at first I believe it was just shutting off. Now it goes to a light black screen.
The first thing I did was flashed the factory image .bat file and everything seemed to go ok but when trying to go to recovery after it went to the light black screen. I turned it off and it booted to the Google screen then off again. Then it booted to the google screen and it froze that way. I can always get it back to the bootloader screen and got it to recovery once by flashing TWRP again using ADB.
TWRP opened once and I tried to do a factory reset but it couldn't find anything and couldn't mount to anything. I got it back to the bootloader again but the recovery has disappeared again. I tried to flash the factory image again but it definitely failed this time.
Please help.
Click to expand...
Click to collapse
Lock your bootloader then reboot to fastboot. If the lock state remains locked try LG flashtool. Link in my signature. If the lock state reverts back to unlocked, then you have to rma your device. If that is the case can you check the variant text in fastboot for me? There should be D820 or D821 and after there should be a letter E or H in (). I want to know that letter in the (). Thanks.
Dont forget to report me your progress

simms22 said:
when youre flashing recovery, which command are you using.. fastboot boot recovery recoveryname.img or fastboot flash recovery recoveryname.img?
Click to expand...
Click to collapse
Hey I'm using "fastboot flash recovery recovery.img" and that's what I've used in the past. I've had a fully functioning rom with fully functioning recovery for a while until yesterday.

bitdomo said:
Lock your bootloader then reboot to fastboot. If the lock state remains locked try LG flashtool. Link in my signature. If the lock state reverts back to unlocked, then you have to rma your device. If that is the case can you check the variant text in fastboot for me? There should be D820 or D821 and after there should be a letter E or H in (). I want to know that letter in the (). Thanks.
Dont forget to report me your progress
Click to expand...
Click to collapse
Ok thanks I'll try this and check the text in fastboot after work today. Thanks for the responses guys.
After reading some more last night I'm afraid it's an emmc problem but I like to be proven wrong sometimes.

Maybe also try this?
http://forum.xda-developers.com/showthread.php?t=2577447

beekay201 said:
Maybe also try this?
http://forum.xda-developers.com/showthread.php?t=2577447
Click to expand...
Click to collapse
I actually have that thread open on my computer. It was my next attempt of repair before starting the thread late last night. Thanks for the suggestion I will certainly try it.
Update: I tried pushing Philz recovery to the phone which seemed to work fine until I selected go to recovery mode. It just went back to that barely light black screen. I'll try again when I get home. Going to try Bitdomo's advice about locking bootloader first.

bitdomo said:
Lock your bootloader then reboot to fastboot. If the lock state remains locked try LG flashtool. Link in my signature. If the lock state reverts back to unlocked, then you have to rma your device. If that is the case can you check the variant text in fastboot for me? There should be D820 or D821 and after there should be a letter E or H in (). I want to know that letter in the (). Thanks.
Dont forget to report me your progress
Click to expand...
Click to collapse
Out of curiosity what's the reason for using two brands, or were they just available so they were used?

bitdomo said:
Lock your bootloader then reboot to fastboot. If the lock state remains locked try LG flashtool. Link in my signature. If the lock state reverts back to unlocked, then you have to rma your device. If that is the case can you check the variant text in fastboot for me? There should be D820 or D821 and after there should be a letter E or H in (). I want to know that letter in the (). Thanks.
Dont forget to report me your progress
Click to expand...
Click to collapse
Bitdomo I'm trying the Flashtool but it's staying at 0% on the firmware update and nothing is popping up on computer or in Device Manager. Had no connection issues prior to the brick or with adb/fastboot. My Ports aren't evening showing at all in DM even if I select show hidden devices.

aburn95 said:
How do I lock the bootloader without being able to put the .zip on my internal memory?
Click to expand...
Click to collapse
In fastboot type
fastboot oem lock
Sent from my Nexus 5 using XDA Free mobile app

jd1639 said:
In fastboot type
fastboot oem lock
Sent from my Nexus 5 using XDA Free mobile app
Click to expand...
Click to collapse
I honestly wanted to do that but it seemed too easy. I was trying to lock it like I did before when i had to send original back to T-Mobile. Sorry and thanks.

bitdomo said:
Lock your bootloader then reboot to fastboot. If the lock state remains locked try LG flashtool. Link in my signature. If the lock state reverts back to unlocked, then you have to rma your device. If that is the case can you check the variant text in fastboot for me? There should be D820 or D821 and after there should be a letter E or H in (). I want to know that letter in the (). Thanks.
Dont forget to report me your progress
Click to expand...
Click to collapse
Ok so it stayed locked so that's a start. I'm back in download mode again but it's staying at 0% and nothing on computer.

I tried to re-download the factory images and flash again using adb. It failed again. Here's a picture of what happened:

Unzip the zip and use manual flash commands. Clikc the link in my signature and read my "adb and fastboot. What is it?" thread of you're unsure of the commands.
Sent from my Nexus 5 using Tapatalk

aburn95 said:
I tried to re-download the factory images and flash again using adb. It failed again. Here's a picture of what happened:
Click to expand...
Click to collapse
You have "remote: flash write failure" error. It means your emmc (internal storage) is broken and you cannot modify the data on it. You have to rma your device.
Just for matter of research can you enter to fastboot and post the variable line here?
Mine is: hammerhead D821(H) 16GB

bitdomo said:
You have "remote: flash write failure" error. It means your emmc (internal storage) is broken and you cannot modify the data on it. You have to rma your device.
Just for matter of research can you enter to fastboot and post the variable line here?
Mine is: hammerhead D821(H) 16GB
Click to expand...
Click to collapse
Sorry I meant to tell you yesterday... D820H 16GB. Should I still be able to toggle the tamper tag so they will take it back with no problems? Or am I screwed?

aburn95 said:
Sorry I meant to tell you yesterday... 820H. Should I still be able to toggle the tamper so they will take it back with no problems? Or am I screwed?
Click to expand...
Click to collapse
You should be able to if you managed to lock the bootloader. The name of the zip does not came into my mind which you have to flash, but you have to do it with the adb sideload command because you cant copy anything to your phone, or use adb push command to push it to the "/" folder because it is mounted to the ram which you can write not like your storage . If you bought your phone from google it does not matter you have tamper flag set to 1.

bitdomo said:
You should be able to if you managed to lock the bootloader. The name of the zip does not came into my mind which you have to flash, but you have to do it with the adb sideload command because you cant copy anything to your phone, or use adb push command to push it to the "/" folder because it is mounted to the ram which you can write not like your storage . If you bought your phone from google it does not matter you have tamper flag set to 1.
Click to expand...
Click to collapse
Ok thanks. I haven't quite figured out the adb sideload function yet. I tried doing it through TWRP but it just sits there and does nothing after selecting. Maybe I'm trying the wrong thing. I got my phone from T-Mobile so I'll need to solve this. Thanks for the help.

This phone is being a real a-hole. I'm trying to boot to stock recovery but it just sits on a screen with a really big android with wiggling antennae. I pressed up+power many times but it stayed that way. So I tried booting to TWRP again and it did but went immediately to an "OpenRecoveryScript," had a little bar at the bottom for a while with some other stuff on the screen, then turned off.
I tried stock recovery again and it went to the little dead android this time but still nothing when I press up+power.

Bricked? Trying to go back to stock.......

Looks like I currently don't have a phone anymore.......and all I was trying to do was go back to stock Lollipop. I was flashing the stock images one at a time as I normally doing instead of using flashall so I could step through each one, and it looks like I accidentally flashed radio to bootloader. Scrolling back up in my command window I found my mistake and where it gave the failed: invalid bootloader message. The problem is before I noticed that I had already issued the "fastboot reboot -bootloader" command (as I was rebooting to flash radio next, and the the rom image). So now it looks like I have no vaild bootloader and I can't even boot into my TWRP recovery. All I get is the damn Google screen. Is there anything I can do to get my bootloader reflashed correctly? Looks like I can't use ADB fastboot because I can't boot to the bootloader. I think I just killed my Nexus with a freaking typo! Any help or suggestions are appreciated as I am not without a phone.

jsgates said:
Looks like I currently don't have a phone anymore.......and all I was trying to do was go back to stock Lollipop. I was flashing the stock images one at a time as I normally doing instead of using flashall so I could step through each one, and it looks like I accidentally flashed radio to bootloader. Scrolling back up in my command window I found my mistake and where it gave the failed: invalid bootloader message. The problem is before I noticed that I had already issued the "fastboot reboot -bootloader" command (as I was rebooting to flash radio next, and the the rom image). So now it looks like I have no vaild bootloader and I can't even boot into my TWRP recovery. All I get is the damn Google screen. Is there anything I can do to get my bootloader reflashed correctly? Looks like I can't use ADB fastboot because I can't boot to the bootloader. I think I just killed my Nexus with a freaking typo! Any help or suggestions are appreciated as I am not without a phone.
Click to expand...
Click to collapse
Strangest thing I ever heard. Turn off phone just press volume_down key while you connect usb cable or press volume_down + volume_up while connect usb cable.

Thanks!!!!
That worked! I think my power button may be acting flaky too. I had tried that but not with the USB cable still plugged in. Re-flashing everything now via fastboot. I haven't been on stock since Kit Kat, so I also just learned about googles fun issue where you have to extract system and boot and flash them manually since they won't fix their batch script. Thanks.

LG GPAD 7 stuck on Fast Boot

Purchased an Lg Gpad 7 Wifi tablet (v400) 2 weeks ago. Came with preinstalled Lollipop android so i couldnt install a recovery rom to flash any other custom roms. Downgraded to Kitkat version following the instructions on Xda forums and succesfully installed Twrp. When i installed Cyanogenmod 12.1 through Twrp i got stuck in fastboot screen.
Any suggestions and / or solutions would be greatly appreciated.

I had a similar problem.. Only mine was stuck at the bootloader. Go in TWRP and repair /data and other partitions. My data partition gave me an error since F2FS is a little flaky and some ROMs corrupted it (claimed they supported it). I would recommend erasing the system, cache and data partition if you can't get into TWRP.

The problem is i cant get out of fastboot whatever i try. It says start on bootloader but the tablet just restarts on an empty screen doing nothing.

Hakalai said:
The problem is i cant get out of fastboot whatever i try. It says start on bootloader but the tablet just restarts on an empty screen doing nothing.
Click to expand...
Click to collapse
if you have an sd card, try removing that, then reboot.
if that doesnt work, try entering fastboot command, fastboot continue

Tried without sdcard and i get the same fastboot screen.
How can i give any commands? The only options i have are Restart Bootloader / Restart / Power off. Tried restarting bootloader but i get nothing in return tablet just stays on with nothing on screen.

Hakalai said:
Tried without sdcard and i get the same fastboot screen.
How can i give any commands? The only options i have are Restart Bootloader / Restart / Power off. Tried restarting bootloader but i get nothing in return tablet just stays on with nothing on screen.
Click to expand...
Click to collapse
you said it was stuck on fastboot, if thats the case, install any needed drivers on your pc, connect device to it, open a terminal in the fastboot dir (after you go get fastboot), then try those commands i gave. you could also try, fastboot reboot dont think i mentioned that before.

bweN diorD said:
you said it was stuck on fastboot, if thats the case, install any needed drivers on your pc, connect device to it, open a terminal in the fastboot dir (after you go get fastboot), then try those commands i gave. you could also try, fastboot reboot dont think i mentioned that before.
Click to expand...
Click to collapse
Did as you said but every command i gave gives me an error message in adb terminal. There are new lines in fastboot menu in tablet now. Bottom two are SECURE BOOT - enabled & LOCK STATE - locked.

Hakalai said:
Did as you said but every command i gave gives me an error message in adb terminal. There are new lines in fastboot menu in tablet now. Bottom two are SECURE BOOT - enabled & LOCK STATE - locked.
Click to expand...
Click to collapse
hmm, ok, im guessing it would have said that normally, when not broken. all the command does is try to release it past where its stuck. it doesnt actually flash, lock, unlock, or change anything.
imo, this seems good, because now we know fastboot is working.
i own lg devices, but not your specific device. i would hate to give you some bad advice and make your tablet broken more, but if it were me in this situation, i would try to flash the factory KK firmware you used to downgrade with odin or however you did it. hopefully, that will clean everything up and let it boot properly.
if for whatever reason you cant do that, we could try extracting the factory file, and just flashing recovery and system, those should be the only things that got changed putting on twrp and cm normally.

Sorry, I have the serious proplem wtih my LG pad V400, I rooted it and using <LG Flash Tool 2014> with <V40010c_00.kdz> to downgrate the firmware but their is error then my LG pad stuck in fastboot menu as with just turn off, restart and restart bootloader. if i seclect one one them the tablet just logged again the fastboot menu
it stuck on the fastboot menu and i cannot do nay think with it. I can restart with factory restore mode but when select yes to restore, it will restart and log in fastboot menu again.
I downloaded adb and fastboot program and put in one folder <Minimal ADB and Fastboot> in C:\Program Files (x86)\Minimal ADB and Fastboot
I dont have recovery image so i download file <cm-13.0-20160421-NIGHTLY-v400-recovery.img> form your link to download TWRP file
move it to folder of fastboot programe and changed its name to <recovery.img>
I turn on the tablet and it waited at fastboot menu
when i run the command <fasboot flash recovery recovery.img> and they said some thing wrong like in picture
please help me

Pixel 4a stuck in fastboot mode

Tried to follow this guide to root my pixel 4a and completed all steps up to 3.4. My phone is now stuck in fastboot mode and I can't get into recovery mode to do a factory reset. Not sure what to do, I'm a little lost. I accidentally used this or this image for Android 10 when I think I should have used this image for Android 11.
Any help would be very appreciated.

Maybe you can use this guide:
[GUIDE] UNLOCKING, DOWNGRADING TO A10, TWRP, ROOT
Hello, I'm posting this guide for those (like me) who can't do without TWRP on their device. I'm providing only a step-by-step explanation. Credits to @nikamura for his kernel and TWRP...
forum.xda-developers.com
And start on this line in "First Step" section:
Plug the phone into a usb port of your pc.
Then complete all the tasks in "Second Step" section to get your phone at least booting in android 10.

ifixibrick said:
Tried to follow this guide to root my pixel 4a and completed all steps up to 3.4. My phone is now stuck in fastboot mode and I can't get into recovery mode to do a factory reset. Not sure what to do, I'm a little lost. I accidentally used this or this image for Android 10 when I think I should have used this image for Android 11.
Any help would be very appreciated.
Click to expand...
Click to collapse
Run the online flash tool from bootloader screen bro. Make sure you install adb and fastboot tools.

Raj Pandiyan said:
Run the online flash tool from bootloader screen bro. Make sure you install adb and fastboot tools.
Click to expand...
Click to collapse
How do I do that? I seem to be stuck in fastboot mode.

ifixibrick said:
How do I do that? I seem to be stuck in fastboot mode.
Click to expand...
Click to collapse
Is it bricked? Cannot flash stock Android to remove ArcaneOS
I recently purchased a used Pixel 4a, and I now understand why the seller was offering such good price for it and why he refused to respond to me now I have it. This phone has ArcanseOS 10 installed, which has only 3 apps installed... Setting...
forum.xda-developers.com

reboot to recovery, press volume up + power to bring up the recovery settings, turn on sideloading
then adb sideload the factory image.

jawz101 said:
reboot to recovery, press volume up + power to bring up the recovery settings, turn on sideloading
then adb sideload the factory image.
Click to expand...
Click to collapse
Hello. Currently stuck in fastboot mode. Using the volume buttons to select recovery mode and pressing the power button to go into it doesn't take me to recovery mode. The screen briefly goes dark before entering fastboot again. I think the phone is trying to restart but not getting past fastboot mode.

ifixibrick said:
Hello. Currently stuck in fastboot mode. Using the volume buttons to select recovery mode and pressing the power button to go into it doesn't take me to recovery mode. The screen briefly goes dark before entering fastboot again. I think the phone is trying to restart but not getting past fastboot mode.
Click to expand...
Click to collapse
Can you type fastboot reboot recovery and get into recovery mode? You'll see a little Android guy with a red thing if you're in there.
If that doesn't work- it almost sounds as though your recovery partition is deleted or something. You can reflash the recovery from fastboot.

Hey, I had the same problem. I've got it resolved now and wasn't able to find any help on how to resolve it, but this thread is as close as it came, so in the off chance that somebody else comes along, I thought I'd write up the steps I took.
Because it was in fastboot mode, I was able to easily restore my phone to factory settings by running flash factory image script I downloaded here.
My original image was sunfish-rq3a.210605.005-factory-be541467 which I followed the steps with but couldn't get it to work. I got to the Google logo with a status bar that just ran forever. But the flash-all.sh script worked to get the phone booting again.
So what I did to get Magisk to work was to use that same factory image site to download an older version. I used a version that was listed in a different root guide with the idea that maybe the version I tried before wasn't compatible with magisk, but presumably the one from the guide was. So I tried sunfish-rq1a.210105.002, ran the flash-all in fastboot, and confirmed that it booted--it did.
Next I redid 2.2 through 3 and it worked, and the boot completed with Magisk installed. Everything seems to be working fine now.