[General Questions and Answers] amm8990:
I have it too. By searching by IMEI I found that it is LINGWIN with the brand "TIN Easy 4G". It has package installed package:com.android.packageinstaller and you can see all the other apps:

Installed app

./adb shell pm list packages
package:com.qualcomm.fastdormancy
package:com.qualcomm.qti.modemtestmode
package:com.qualcomm.timeservice
package:com.android.voicedialer
package:com.uni.autotest
package:com.android.defcontainer
package:com.wdstechnology.android.kryten
package:com.borqs.camera
package:com.android.contacts
package:com.android.phone
package:org.codeaurora.bluetooth.bttestapp
package:com.oma.drm.server
package:com.android.calculator2
package:com.android.htmlviewer
package:com.android.cellbroadcastreceiver
package:com.android.bluetooth
package:com.android.providers.calendar
package:com.qualcomm.gsmtuneaway
package:com.guobi.gbime.alph
package:com.android.calendar
package:com.android.browser
package:com.dsi.ant.server
package:com.android.music
package:com.borqs.exif
package:org.codeaurora.ims
package:com.qualcomm.qti.confdialer
package:com.qualcomm.simcontacts
package:com.qualcomm.qti.networksetting
package:com.android.onetimeinitializer
package:com.android.providers.downloads.ui
package:com.android.documentsui
package:com.android.sharedstoragebackup
package:com.qualcomm.snapdragon.sample
package:com.android.vpndialogs
package:com.android.mms
package:com.android.provision
package:com.android.providers.media
package:com.android.certinstaller
package:com.caf.fmradio
package:com.android.dreams.phototable
package:com.android.settings
package:com.featurephone.launcher
package:com.android.multisimsettings
package:com.android.gallery3d
package:com.qualcomm.sta
package:com.qualcomm.interfacepermissions
package:com.adups.fota.sysoper
package:com.android.packageinstaller
package:com.android.providers.telephony
package:com.svox.pico
package:com.qualcomm.qct.dlt
package:com.qrd.omadownload
package:com.android.email
package:com.qualcomm.qti.mousepointer
package:com.android.dialer
package:com.qti.backupagent
package:com.android.wallpapercropper
package:com.android.location.fused
package:com.android.backupconfirm
package:com.android.providers.settings
package:com.qualcomm.qti.carrierconfigure
package:com.qualcomm.qti.loadcarrier
package:com.qualcomm.qcrilmsgtunnel
package:com.borqs.gif
package:com.android.providers.downloads
package:qualcomm.android.LEDFlashlight
package:com.android.musicfx
package:com.android.soundrecorder
package:com.android.recorder
package:com.qualcomm.qti.calendarlocalaccount
package:com.android.proxyhandler
package:com.android.qrdfileexplorer
package:com.qualcomm.svi
package:com.android.inputdevices
package:com.whatsapp
package:com.android.stk
package:com.android.nativeaudiolatency
package:com.qualcomm.shutdownlistner
package:com.android.providers.userdictionary
package:com.qualcomm.qti.phonefeature
package:com.android.pacprocessor
package:org.codeaurora.bluetooth
package:com.qualcomm.location.qvtester
package:com.featurephone.quicksettings
package:com.android.printspooler
package:com.sprd.runtime
package:android
package:com.android.providers.contacts
package:org.codeaurora.bluetooth.hiddtestapp
package:com.qualcomm.location
package:com.sprd.ramoptimizer
package:com.android.protips
package:com.android.externalstorage
package:com.android.dreams.basic
package:com.android.systemui
package:com.easervice
package:com.android.keychain
package:com.android.smspush
package:com.qualcomm.qcom_qmi
package:com.android.contacts.common
package:com.oma.drm
package:com.qti.antitheftdemo
package:com.qualcomm.cabl
package:com.quicinc.wipoweragent
package:com.adups.fota
package:com.android.deskclock
package:com.android.keyguard
package:com.qti.service.colorservice
package:com.qualcomm.location.XT
package:com.android.shell
package:com.qualcomm.qti.snapdragon.qdcm_mobile
package:com.codeaurora.fmrecording

I manage to update WhatsApp that was preinstalled using the recent apk, but that is it.

When I try to Install Telegram for example I get:

./adb -s xxx shell getprop
[DEVICE_PROVISIONED]: [1]
[af.resampler.quality]: [4]
[audio.offload.buffer.size.kb]: [32]
[audio.offload.gapless.enabled]: [true]
[audio.offload.min.duration.secs]: [30]
[av.offload.enable]: [false]
[bluetooth.hfp.client]: [1]
[cameradaemon.SaveMemAtBoot]: [1]
[config.disable_atlas]: [true]
[dalvik.vm.heapgrowthlimit]: [48m]
[dalvik.vm.heapmaxfree]: [2m]
[dalvik.vm.heapminfree]: [512k]
[dalvik.vm.heapsize]: [128m]
[dalvik.vm.heapstartsize]: [5m]
[dalvik.vm.heaptargetutilization]: [0.75]
[dalvik.vm.stack-trace-file]: [/data/anr/traces.txt]
[debug.composition.type]: [dyn]
[debug.egl.hw]: [1]
[debug.force_rtl]: [0]
[debug.hwc.dynThreshold]: [2.5]
[debug.mdpcomp.logs]: [0]
[debug.sf.hw]: [1]
[debug.sf.hwc.canUseABC]: [1]
[debug.sf.swaprect]: [1]
[dev.bootcomplete]: [1]
[dev.pm.dyn_samplingrate]: [1]
[dhcp.wlan0.dns1]: [192.168.2.1]
[dhcp.wlan0.dns2]: []
[dhcp.wlan0.dns3]: []
[dhcp.wlan0.dns4]: []
[dhcp.wlan0.domain]: []
[dhcp.wlan0.gateway]: [192.168.2.1]
[dhcp.wlan0.ipaddress]: [192.168.2.8]
[dhcp.wlan0.leasetime]: [85536]
[dhcp.wlan0.mask]: [255.255.255.0]
[dhcp.wlan0.mtu]: []
[dhcp.wlan0.pid]: [4752]
[dhcp.wlan0.reason]: [BOUND]
[dhcp.wlan0.result]: [ok]
[dhcp.wlan0.server]: [192.168.2.1]
[dhcp.wlan0.vendorInfo]: []
[gsm.current.phone-type]: [1]
[gsm.network.type]: [Unknown]
[gsm.operator.alpha]: []
[gsm.operator.iso-country]: []
[gsm.operator.isroaming]: [false]
[gsm.operator.numeric]: []
[gsm.sim.state]: [ABSENT]
[gsm.version.baseband]: [O.1.2.c3.5-00065-8909_GEN_PACK-1]
[gsm.version.ril-impl]: [Qualcomm RIL 1.0]
[hw.cabl.version]: [2.0.20140905]
[hw.cabl.yuv]: [0]
[hw.sf.app_buff_count]: [3]
[init.svc.adbd]: [running]
[init.svc.atfwd]: [stopped]
[init.svc.audiod]: [running]
[init.svc.bootanim]: [stopped]
[init.svc.carrier_switcher]: [stopped]
[init.svc.cnd]: [restarting]
[init.svc.config_bluetooth]: [stopped]
[init.svc.debuggerd]: [running]
[init.svc.dhcpcd_wlan0]: [running]
[init.svc.dpmd]: [running]
[init.svc.drm]: [running]
[init.svc.flash_recovery]: [stopped]
[init.svc.fotabinder]: [running]
[init.svc.fuse_uicc0]: [running]
[init.svc.healthd]: [running]
[init.svc.ims_rtp_daemon]: [running]
[init.svc.imsdatadaemon]: [running]
[init.svc.imsqmidaemon]: [running]
[init.svc.imsstarter]: [stopped]
[init.svc.installd]: [running]
[init.svc.irsc_util]: [stopped]
[init.svc.keystore]: [running]
[init.svc.loc_launcher]: [running]
[init.svc.media]: [running]
[init.svc.netd]: [running]
[init.svc.netmgrd]: [running]
[init.svc.p2p_supplicant]: [running]
[init.svc.per_mgr]: [running]
[init.svc.perfd]: [running]
[init.svc.ppd]: [restarting]
[init.svc.ptt_socket_app]: [running]
[init.svc.qcamerasvr]: [running]
[init.svc.qcom-c_core-sh]: [stopped]
[init.svc.qcom-c_main-sh]: [stopped]
[init.svc.qcom-debug]: [stopped]
[init.svc.qcom-post-boot]: [stopped]
[init.svc.qcom-sh]: [stopped]
[init.svc.qcom-usb-sh]: [stopped]
[init.svc.qmuxd]: [running]
[init.svc.qseecomd]: [running]
[init.svc.qti]: [running]
[init.svc.ril-daemon]: [running]
[init.svc.rmt_storage]: [running]
[init.svc.sdcard]: [running]
[init.svc.servicemanager]: [running]
[init.svc.ssr_setup]: [stopped]
[init.svc.surfaceflinger]: [running]
[init.svc.tftp_server]: [running]
[init.svc.thermal-engine]: [running]
[init.svc.time_daemon]: [running]
[init.svc.touch]: [stopped]
[init.svc.ueventd]: [running]
[init.svc.vm_bms]: [running]
[init.svc.vold]: [running]
[init.svc.wcnss-service]: [running]
[init.svc.zygote]: [running]
[keyguard.no_require_sim]: [true]
[mdc_initial_max_retry]: [5]
[media.aac_51_output_enabled]: [true]
[media.stagefright.enable-aac]: [true]
[media.stagefright.enable-fma2dp]: [true]
[media.stagefright.enable-http]: [true]
[media.stagefright.enable-player]: [true]
[media.stagefright.enable-qcp]: [true]
[media.stagefright.enable-scan]: [true]
[mm.enable.qcom_parser]: [262143]
[mmp.enable.3g2]: [true]
[net.bt.name]: [Android]
[net.change]: [net.dns1]
[net.dns1]: [192.168.2.1]
[net.hostname]: [android-3e2ce018adeeaf1b]
[net.qtaguid_enabled]: [1]
[net.tcp.buffersize.default]: [4096,87380,524288,4096,16384,110208]
[net.tcp.buffersize.edge]: [4093,26280,35040,4096,16384,35040]
[net.tcp.buffersize.evdo]: [4094,87380,524288,4096,16384,262144]
[net.tcp.buffersize.gprs]: [4092,8760,11680,4096,8760,11680]
[net.tcp.buffersize.hsdpa]: [4094,87380,1220608,4096,16384,1220608]
[net.tcp.buffersize.hspa]: [4094,87380,1220608,4096,16384,1220608]
[net.tcp.buffersize.hspap]: [4094,87380,1220608,4096,16384,1220608]
[net.tcp.buffersize.hsupa]: [4094,87380,1220608,4096,16384,1220608]
[net.tcp.buffersize.lte]: [2097152,4194304,8388608,262144,524288,1048576]
[net.tcp.buffersize.umts]: [4094,87380,110208,4096,16384,110208]
[net.tcp.buffersize.wifi]: [524288,2097152,4194304,262144,524288,1048576]
[net.tcp.default_init_rwnd]: [60]
[persist.audio.fluence.speaker]: [true]
[persist.audio.fluence.voicecall]: [true]
[persist.audio.fluence.voicerec]: [false]
[persist.camera.capture.animate]: [1]
[persist.camera.longshot.stages]: [1]
[persist.camera.preview.size]: [0]
[persist.camera.qcom.misc]: [0]
[persist.camera.tintless]: [enable]
[persist.camera.tn.disable]: [0]
[persist.cne.feature]: [4]
[persist.data.mode]: [concurrent]
[persist.data.netmgrd.qos.enable]: [true]
[persist.debug.wfd.enable]: [1]
[persist.demo.hdmirotationlock]: [false]
[persist.dpm.feature]: [3]
[persist.fuse_sdcard]: [true]
[persist.gps.qc_nlp_in_use]: [1]
[persist.hwc.enable_vds]: [1]
[persist.hwplatform]: [QRD]
[persist.ims.disabled]: [0]
[persist.loc.nlp_name]: [com.qualcomm.location]
[persist.mm.sta.enable]: [1]
[persist.radio.adb_log_on]: [0]
[persist.radio.apm_sim_not_pwdn]: [1]
[persist.radio.calls.on.ims]: [0]
[persist.radio.csvt.enabled]: [false]
[persist.radio.custom_ecc]: [1]
[persist.radio.eons.enabled]: [false]
[persist.radio.ignore_dom_time]: [5]
[persist.radio.ims.registered]: [0]
[persist.radio.jbims]: [0]
[persist.radio.lte_vrte_ltd]: [1]
[persist.radio.mt_sms_ack]: [20]
[persist.radio.multisim.config]: [ssss]
[persist.radio.rat_on]: [combine]
[persist.radio.restore_mode_pref]: [1]
[persist.radio.sib16_support]: [1]
[persist.radio.start_ota_daemon]: [0]
[persist.radio.trigger.autoload]: [true]
[persist.radio.trigger.brand]: [FtrPhone]
[persist.radio.trigger.target]: [India]
[persist.rild.nitz_long_ons_0]: []
[persist.rild.nitz_long_ons_1]: []
[persist.rild.nitz_long_ons_2]: []
[persist.rild.nitz_long_ons_3]: []
[persist.rild.nitz_plmn]: []
[persist.rild.nitz_short_ons_0]: []
[persist.rild.nitz_short_ons_1]: []
[persist.rild.nitz_short_ons_2]: []
[persist.rild.nitz_short_ons_3]: []
[persist.service.bdroid.bdaddr]: [xxx]
[persist.subtype]: [0]
[persist.sys.allowinstallapp]: [0]
[persist.sys.country]: [US]
[persist.sys.dalvik.vm.lib]: [libdvm.so]
[persist.sys.isUsbOtgEnabled]: [1]
[persist.sys.language]: [en]
[persist.sys.localevar]: []
[persist.sys.profiler_ms]: [0]
[persist.sys.showbottomactionbar]: [1]
[persist.sys.silent]: [0]
[persist.sys.ssr.restart_level]: [modem]
[persist.sys.strict_op_enable]: [false]
[persist.sys.synaptics_dsx.qhd]: [false]
[persist.sys.timezone]: [Europe/Sarajevo]
[persist.sys.usb.config.extra]: [none]
[persist.sys.usb.config]: [diag,rmnet_qti_bam,adb]
[persist.sys.whitelist]: [/system/etc/whitelist_appops.xml]
[persist.timed.enable]: [true]
[persist.ts.postmakeup]: [true]
[persist.ts.rtmakeup]: [true]
[persist.tuning.qdcm]: [1]
[rec.playback.conc.disabled]: [true]
[ril.ecclist]: [911,112]
[ril.qcril_pre_init_lock_held]: [0]
[ril.subscription.types]: [NV,RUIM]
[rild.libargs]: [-d /dev/smd0]
[rild.libpath]: [/system/vendor/lib/libril-qc-qmi-1.so]
[ro.adb.secure]: [1]
[ro.alarm_boot]: [false]
[ro.allow.mock.location]: [0]
[ro.am.penalise_large_apps.pss]: [30000000]
[ro.baseband]: [msm]
[ro.bluetooth.dun]: [true]
[ro.bluetooth.hfp.ver]: [1.6]
[ro.bluetooth.sap]: [true]
[ro.board.platform]: [msm8909]
[ro.boot.baseband]: [msm]
[ro.boot.bootdevice]: [7824900.sdhci]
[ro.boot.console]: [ttyHSL0]
[ro.boot.emmc]: [true]
[ro.boot.hardware]: [qcom]
[ro.boot.serialno]: [xxxx]
[ro.bootloader]: [unknown]
[ro.bootmode]: [unknown]
[ro.browser_audio_buffer_limit]: [10]
[ro.browser_image_size_threshold]: [262144]
[ro.browser_optimizations]: [true]
[ro.browser_video_buffer_limit]: [15]
[ro.build.characteristics]: [default]
[ro.build.date.utc]: [1519640479]
[ro.build.date]: [2018年 02月 26日 星期一 18:21:19 CST]
[ro.build.description]: [msm8909_512-user 4.4.4 KTU84P eng.root.20180226.181133 release-keys]
[ro.build.display.id]: [TIM_Easy_4G_V01_20180226]
[ro.build.fingerprint]: [TIM/N108/N108:4.4.4/KTU84P/root02261813:user/release-keys]
[ro.build.host]: [spwork-chenjianwei]
[ro.build.id]: [KTU84P]
[ro.build.product]: [N108]
[ro.build.tags]: [release-keys]
[ro.build.type]: [user]
[ro.build.user]: [root]
[ro.build.version.base_os]: []
[ro.build.version.codename]: [REL]
[ro.build.version.incremental]: [eng.root.20180226.181133]
[ro.build.version.release]: [4.4.4]
[ro.build.version.sdk]: [19]
[ro.build.version.security_patch]: []
[ro.carrier]: [unknown]
[ro.com.android.dataroaming]: [true]
[ro.com.android.dateformat]: [MM-dd-yyyy]
[ro.config.alarm_alert]: [Alarm_Classic.ogg]
[ro.config.low_ram]: [true]
[ro.config.max_starting_bg]: [8]
[ro.config.notification_sound]: [pixiedust.ogg]
[ro.config.ringtone]: [Ring_Synth_04.ogg]
[ro.crypto.state]: [unencrypted]
[ro.cutoff_voltage_mv]: [3200]
[ro.debuggable]: [0]
[ro.device.ram]: [512]
[ro.factorytest]: [0]
[ro.fm.transmitter]: [false]
[ro.fota.app]: [5]
[ro.fota.device]: [TIM Easy 4G]
[ro.fota.oem]: [uniscope_wm8909]
[ro.fota.platform]: [MSM8909]
[ro.fota.type]: [phone]
[ro.fota.version]: [TIM_Easy_4G_V01_20180226_20180226-1821]
[ro.gps.agps_provider]: [1]
[ro.hardware]: [qcom]
[ro.hwui.text_large_cache_height]: [2048]
[ro.lean]: [true]
[ro.min_freq_0]: [400000]
[ro.opengles.version]: [196608]
[ro.pip.gated]: [0]
[ro.product.board]: [msm8909]
[ro.product.brand]: [TIM]
[ro.product.cpu.abi2]: [armeabi]
[ro.product.cpu.abi]: [armeabi-v7a]
[ro.product.device]: [N108]
[ro.product.hardware_verno]: [TIM_N108_Hardware_V1.0]
[ro.product.locale.language]: [it]
[ro.product.locale.region]: [IT]
[ro.product.manufacturer]: [TIM]
[ro.product.model]: [TIM Easy 4G]
[ro.product.name]: [N108]
[ro.qc.sdk.audio.fluencetype]: [none]
[ro.qc.sdk.audio.ssr]: [false]
[ro.qcom.screencolor]: [1]
[ro.qualcomm.bluetooth.ftp]: [true]
[ro.qualcomm.bluetooth.hfp]: [true]
[ro.qualcomm.bluetooth.hsp]: [true]
[ro.qualcomm.bluetooth.map]: [true]
[ro.qualcomm.bluetooth.nap]: [true]
[ro.qualcomm.bluetooth.opp]: [true]
[ro.qualcomm.bluetooth.pbap]: [true]
[ro.qualcomm.bt.hci_transport]: [smd]
[ro.qualcomm.cabl]: [2]
[ro.revision]: [0]
[ro.ril.svdo]: [false]
[ro.ril.svlte1x]: [false]
[ro.runtime.firstboot]: [1551878527055]
[ro.secure]: [1]
[ro.serialno]: [xxxx]
[ro.sf.lcd_density]: [160]
[ro.staticwallpaper.pixelformat]: [RGB_565]
[ro.sys.fw.bg_apps_limit]: [16]
[ro.sys.fw.bservice_age]: [5000]
[ro.sys.fw.bservice_enable]: [true]
[ro.sys.fw.bservice_limit]: [5]
[ro.sys.fw.empty_app_percent]: [50]
[ro.sys.fw.key_repeat_delay]: [40]
[ro.sys.fw.trim_cache_percent]: [100]
[ro.sys.fw.trim_empty_percent]: [100]
[ro.sys.fw.trim_enable_memory]: [1073741824]
[ro.sys.fw.use_trim_settings]: [true]
[ro.sys.usb.default.config]: [diag,rmnet_qti_bam]
[ro.telephony.call_ring.multiple]: [false]
[ro.telephony.default_network]: [9]
[ro.use_data_netmgrd]: [true]
[ro.vendor.extension_library]: [/vendor/lib/libqc-opt.so]
[ro.wifi.channels]: []
[security.perf_harden]: [1]
[service.bootanim.exit]: [1]
[service.qti.ims.enabled]: [1]
[swe.tile.height]: [128]
[swe.tile.maxtile]: [128]
[swe.tile.width]: [128]
[sys.audio.init]: [true]
[sys.boot_completed]: [1]
[sys.ims.DATA_DAEMON_STATUS]: [1]
[sys.ims.QMI_DAEMON_STATUS]: [1]
[sys.keymaster.loaded]: [true]
[sys.listeners.registered]: [true]
[sys.settings_global_version]: [1]
[sys.settings_secure_version]: [1]
[sys.sysctl.extra_free_kbytes]: [900]
[sys.sysctl.tcp_def_init_rwnd]: [60]
[sys.usb.config]: [diag,rmnet_qti_bam,adb]
[sys.usb.rps_mask]: [0]
[sys.usb.state]: [diag,rmnet_qti_bam,adb]
[telephony.lteOnCdmaDevice]: [1]
[tunnel.audio.encode]: [false]
[use.voice.path.for.pcm.voip]: [true]
[voice.playback.conc.disabled]: [true]
[voice.record.conc.disabled]: [true]
[voice.voip.conc.disabled]: [true]
[vold.post_fs_data_done]: [1]
[wifi.interface]: [wlan0]
[wlan.driver.ath]: [0]
[wlan.driver.config]: [/data/misc/wifi/WCNSS_qcom_cfg.ini]
[wlan.driver.status]: [ok]

With ./adb reboot recovery I can reboot phone in recovery mode, but how can I install apps then?