Dual boot windows 10 and manjaro[Resolved]

Hello everybody
after the installation of manjaro and the subsequent restart where everything works great including the initial os choice menu, it signals me a substantial update to do and after having done it, however, without any error at the next restart the pc no longer detecting the ssd sends me back to the bios, by turning it off and on again I can go back to windows but manjaro is no longer detected and the os choice menu also disappears … and yes I put the bootloader in the uefi partition
#[mirko@mirko-minipcpn50 ~]$ inxi -Fx
Host: mirko-minipcpn50 Kernel: 5.9.16-1-MANJARO x86_64 bits: 64
compiler: gcc v: 10.2.0 Desktop: KDE Plasma 5.20.4
Distro: Manjaro Linux
Type: Mini-pc System: ASUSTeK product: MINIPC PN50 v: 0409
Mobo: ASUSTeK model: PN50 serial: UEFI: ASUSTeK
v: 0409 date: 06/30/2020
Info: 8-Core model: AMD Ryzen 7 4700U with Radeon Graphics bits: 64
type: MCP arch: Zen 2 rev: 1 L2 cache: 4 MiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
bogomips: 31952
Speed: 1397 MHz min/max: 1400/2000 MHz boost: enabled
Core speeds (MHz): 1: 1397 2: 1397 3: 1397 4: 1397 5: 1397 6: 1397
7: 1397 8: 1397
Device-1: AMD Renoir vendor: ASUSTeK driver: amdgpu v: kernel
bus ID: 05:00.0
Display: x11 server: X.Org 1.20.10 driver: amdgpu,ati
unloaded: modesetting resolution: 1440x900~60Hz
OpenGL: renderer: AMD RENOIR (DRM 3.39.0 5.9.16-1-MANJARO LLVM 11.0.0)
v: 4.6 Mesa 20.3.1 direct render: Yes
Device-1: AMD driver: snd_hda_intel v: kernel bus ID: 05:00.1
Device-2: AMD Raven/Raven2/FireFlight/Renoir Audio Processor
driver: N/A bus ID: 05:00.5
Device-3: AMD Family 17h HD Audio vendor: ASUSTeK
driver: snd_hda_intel v: kernel bus ID: 05:00.6
Sound Server: ALSA v: k5.9.16-1-MANJARO
Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
vendor: ASUSTeK driver: r8169 v: kernel port: fc00 bus ID: 02:00.0
IF: enp2s0f0 state: up speed: 1000 Mbps duplex: full
mac: 24:4b:fe:c8:7a:2d
Device-2: Intel Wireless 8265 / 8275 driver: iwlwifi v: kernel
port: f000 bus ID: 03:00.0
IF: wlp3s0 state: down mac: 4e:2a:6f:36:ce:18
Local Storage: total: 476.94 GiB used: 8.84 GiB (1.9%)
ID-1: /dev/nvme0n1 vendor: Intel model: SSDPEKNW512G8 size: 476.94 GiB
temp: 31.9 C
ID-1: / size: 144.05 GiB used: 8.79 GiB (6.1%) fs: ext4
dev: /dev/nvme0n1p5
ID-2: /boot/efi size: 96 MiB used: 50.6 MiB (52.7%) fs: vfat
dev: /dev/nvme0n1p1
Alert: No Swap data was found.
System Temperatures: cpu: 42.2 C mobo: N/A gpu: amdgpu temp: 34.0 C
Fan Speeds (RPM): N/A
Processes: 219 Uptime: 16m Memory: 7.26 GiB used: 2.07 GiB (28.5%)
Init: systemd Compilers: gcc: N/A Packages: 1250 Shell: Bash v: 5.1.0
inxi: 3.2.01
[mirko@mirko-minipcpn50 ~]$ #

Hello @cec , I’m only a not expert user, but sometimes I try to boot the system with the installation Manjaro pendrive. when i have got the boot menu for installing, go to the end and select detect other partition to boot. If you could start from here, you can udate-grub. Hope,

thank you very much for the advice so I can get manjaro to start but after an update-grub on the next reboot I’m back at the same point …

This post will probably help you get Manjaro installed correctly besides Windows or give you some hints on what to check/enable/disable.

Sure the best is the method by @hanzel, but as a neebie I am, I’ll try to save a UEFI entrance from Manjaro console :grin::
sudo efibootmgr -c -d /dev/nvme0n1p1 -p 1 -L Manjaro_HD -l /EFI/MANJARO/GRUBX64.EFI
supossing your EFI/boot is in partition 1
The same for windows:
sudo efibootmgr -c -d /dev/nvme0n1p1 -p 1 -L Windows -l /EFI/MICROSOFT/BOOT/BOOTMGFW.EFI
(adapt to your units)
After that, try again with update-grub.

To see the result: efibootmgr -v
To change the boot order: sudo efibootmgr -o 0,2,1,3 (your order!!)

thank you very much Joan_Tondo and Hanzel because thanks to the two commands you posted I was able to restart in windows, already a success because first it returned to the bios, and then with a command posted by Hanzel from windows "bcdedit / set {bootmgr} path \ EFI \ manjaro \ grubx64.efi "I was able to restore the multiboot.
Thank you all!!