[OnePlus 7 Pro Guides, News, & Discussion] kw0n2k:
So upon doing this, I am getting the following erros:

c:\EfsTools-0.10-modded-1.2-win32>EfsTools.exe uploadDirectory -i mcfg_sw.mbn -o / -s 1

Extracting MBN file 'mcfg_sw.mbn' ...

ItemFile:/nv/item_files/ims/IMSVoiceDynamicConfig

ItemFile:/nv/item_files/ims/qp_ims_qos_precondition

ItemFile:/nv/item_files/ims/IMSVideoDynamicConfig

ItemFile:/nv/item_files/ims/IMSEmerDynamicConfig

ItemFile:/nv/item_files/ims/IMSRTPDynamicConfig

ItemFile:/nv/item_files/ims/IMSCodecDynamicConfig

ItemFile:/nv/item_files/ims/IMSTestDynamicConfig

ItemFile:/nv/item_files/ims/IMSWifiDynamicConfig

ItemFile:/ims/imshandoverconfig

ItemFile:/nv/item_files/ims/qp_ims_plani_config

ItemFile:/nv/item_files/ims/ims_sip_config

ItemFile:/nv/item_files/ims/qp_ims_cap_discovery_config

ItemFile:/nv/item_files/ims/qp_ims_rcs_client_config

ItemFile:/nv/item_files/ims/DANPrivateSettings

ItemFile:/nv/item_files/ims/qp_ims_xcap_private_config_item

ItemFile:/nv/item_files/ims/ims_user_agent

ItemFile:/nv/item_files/ims/IMS_enable

ItemFile:/nv/item_files/ims/ims_operation_mode

ItemFile:/nv/item_files/ims/qp_ims_service_enablement_config

ItemFile:/nv/item_files/ims/qp_ims_common_config

ItemFile:/nv/item_files/ims/qp_ims_reg_config_db

ItemFile:/nv/item_files/ims/RegistrationConfiguration

ItemFile:/nv/item_files/ims/SMSConfiguration

ItemFile:/nv/item_files/ims/DANConfiguration

ItemFile:/nv/item_files/ims/qp_ims_xcap_common_config

ItemFile:/nv/item_files/ims/qp_ims_ut_config_item

ItemFile:/nv/item_files/data/wlan_config/wlan_offload_config

ItemFile:/nv/item_files/modem/data/3gpp/ps/modem_def_prof_support

ItemFile:/data/ds_dsd_attach_profile.txt

ItemFile:/data/iwlan_s2b_config.xml

ItemFile:/data/ds_andsf_config.txt

ItemFile:/data/default_andsf.xml

ItemFile:/data/andsf.xml

ItemFile:/Data_Profiles/Profile1

ItemFile:/Data_Profiles/Profile2

ItemFile:/Data_Profiles/Profile3

ItemFile:/nv/item_files/modem/data/3gpp/dsmgr/emergency_apn_type

ItemFile:/nv/item_files/data/wlan_config/wlan_offload_config

ItemFile:/data/ds_dsd_attach_profile.txt

ItemFile:/data/iwlan_s2b_config.xml

ItemFile:/data/default_andsf.xml

ItemFile:/data/andsf.xml

ItemFile:/data/ds_andsf_config.txt

ItemFile:/Data_Profiles/Profile1

ItemFile:/Data_Profiles/Profile2

ItemFile:/Data_Profiles/Profile3

ItemFile:/Data_Profiles/Profile4

ItemFile:/nv/item_files/modem/data/3gpp/dsmgr/emergency_apn_type

Nv:01918

Nv:01920

ItemFile:/nv/item_files/modem/lte/rrc/cap/diff_fdd_tdd_fgi_enable

Nv:00071

ItemFile:/nv/item_files/modem/mmode/sms_domain_pref

ItemFile:/nv/item_files/modem/mmode/sms_mandatory

ItemFile:/nv/item_files/modem/mmode/voice_domain_pref

ItemFile:/nv/item_files/modem/mmode/ue_based_cw

ItemFile:/nv/item_files/modem/nas/emm_nas_nv_items

ItemFile:/nv/item_files/modem/mmode/custom_emerg_info

ItemFile:/nv/item_files/modem/mmode/mid_call_srvcc_info

ItemFile:/nv/item_files/modem/mmode/get_net_auto_mode

ItemFile:/nv/item_files/modem/nas/lte_nas_ignore_mt_csfb_during_volte_call

ItemFile:/nv/item_files/modem/mmode/lte_emerg_redial

Nv:00848

Nv:00849

Nv:00909

Nv:01016

Nv:01017

Nv:03006

Nv:03532

Nv:03533

Nv:06850

Nv:04722

Nv:00010

Nv:00562

Nv:06830

Nv:06831

ItemFile:/sd/rat_acq_order

ItemFile:/nv/item_files/modem/mmode/supplement_service_domain_pref

ItemFile:/nv/item_files/modem/mmode/wifi_config

ItemFile:/nv/item_files/modem/sms/mmgsdi_refresh_vote_ok

ItemFile:/nv/item_files/modem/mmode/sms_domain_pref

ItemFile:/nv/item_files/modem/mmode/sms_mandatory

ItemFile:/nv/item_files/modem/mmode/voice_domain_pref

ItemFile:/nv/item_files/modem/mmode/ue_based_cw

ItemFile:/nv/item_files/modem/nas/emm_nas_nv_items

ItemFile:/nv/item_files/modem/mmode/custom_emerg_info

ItemFile:/nv/item_files/modem/mmode/mid_call_srvcc_info

ItemFile:/nv/item_files/modem/mmode/get_net_auto_mode

ItemFile:/nv/item_files/modem/nas/lte_nas_ignore_mt_csfb_during_volte_call

ItemFile:/nv/item_files/modem/mmode/lte_emerg_redial

Nv:00848

Nv:00849

Nv:00909

Nv:01016

Nv:01017

Nv:03006

Nv:03532

Nv:03533

Nv:06850

Nv:04722

Nv:00010

Nv:00562

Nv:06830

Nv:06831

ItemFile:/sd/rat_acq_order

ItemFile:/nv/item_files/modem/mmode/supplement_service_domain_pref

ItemFile:/nv/item_files/modem/mmode/wifi_config

ItemFile:/nv/item_files/modem/sms/mmgsdi_refresh_vote_ok

Nv:00855

Nv:00880

Nv:00881

Nv:00882

ItemFile:/nv/item_files/wcdma/l1/wl1_nb_rejection_nv

ItemFile:/google/paris_version

ItemFile:/nv/item_files/data/wlan_config/ap_assist_mode_enabled

ItemFile:/policyman/carrier_policy.xml

ItemFile:/google/user_agent_template

ItemFile:/google/ua_model_tr_table.txt

ItemFile:/nv/item_files/data/3gpp/ds_3gpp_mtu

ItemFile:/nv/item_files/datamodem/protocols/ip6_default_mtu

ItemFile:/nv/item_files/modem/data/3gpp/ps/disable_mtu_request

ItemFile:/nv/item_files/modem/nas/isr

ItemFile:/efsprofiles/overideconfig

Use serial port 'COM3'

Processing 'C:\??????\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\data' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\Data_Profiles' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\efsprofiles' ...

Error on upload file '/efsprofiles/overideconfig'. EFS error. Code = 28

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\google' ...

Error on upload file '/google/user_agent_template'. EFS error. Code = 28

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\ims' ...

Error on upload file '/ims/imshandoverconfig'. EFS error. Code = 28

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\data' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\data\3gpp' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\data\wlan_config' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\datamodem' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\datamodem\protocols' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\ims' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\modem' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\modem\data' ...

Processing 'C:\:\??????\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\modem\data\3gpp' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\modem\data\3gpp\dsmgr' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\modem\data\3gpp\ps' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\modem\lte' ...

Processing 'C:\U:\??????\n\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\modem\lte\rrc' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\modem\lte\rrc\cap' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\modem\mmode' ...

Error on upload file '/nv/item_files/modem/mmode/get_net_auto_mode'. EFS error. Code = 28

Error on upload file '/nv/item_files/modem/mmode/lte_emerg_redial'. EFS error. Code = 28

Error on upload file '/nv/item_files/modem/mmode/mid_call_srvcc_info'. EFS error. Code = 28

Error on upload file '/nv/item_files/modem/mmode/supplement_service_domain_pref'. EFS error. Code = 28

Error on upload file '/nv/item_files/modem/mmode/voice_domain_pref'. EFS error. Code = 28

Error on upload file '/nv/item_files/modem/mmode/wifi_config'. EFS error. Code = 28

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\modem\nas' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\modem\sms' ...

Processing 'C:\:\??????\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\wcdma' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\nv\item_files\wcdma\l1' ...

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\policyman' ...

Error on upload file '/policyman/carrier_policy.xml'. EFS error. Code = 28

Processing 'C:\:\??????\\AppData\Local\Temp\EfsTools\y1eeqwfl.0ko\sd' ...

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Error code 28

Anyone with ideas on this?

Phone is a Oneplus 7T Pro HD1913

Edit** Actually disregard. I restarted the phone and bammm VoLTE and VoWIFI is now working perfectly on Boost (Telstra) network. *#*#4636#*#* states all is registered IMS.

Tested calls and working flawlessly.

So now working on a Oneplus 7T Pro HD1913 (Non rooted) device, using Pixel AUNZ Telstra Modem.

Thanks heaps!