Hello @eoslinux, Welcome to the /e/ users forum.
this topic is a quite old guide… better is to follow
[HOWTO] an Unified Install Guide Project for /e/
“adb” is not the right tool to install TWRP but “heimdall”
.
what is your Samsung Galaxy Tab A model number and / or codename ?
not all are supported…
| Retail Branding | Marketing Name | Device | Model |
|---|---|---|---|
| Samsung | Galaxy Tab A | gt510lte | SM-T555 |
| Samsung | Galaxy Tab A 9.7 | gt510ltechn | SM-T555C |
| Samsung | Galaxy Tab A | gt510wifi | SM-T550 |
| Samsung | Galaxy Tab A 9.7 | gt510wifi | SM-T550X |
| Samsung | Galaxy Tab A 9.7 | gt510wifichn | SM-T550 |
| Samsung | Galaxy Tab A 9.7 | gt510wifichn | SM-T550X |
| Samsung | Galaxy Tab A 8.0 | gt58lte | SM-T355 |
| Samsung | Galaxy Tab A 8.0 | gt58lte | SM-T355Y |
| Samsung | Galaxy Tab A S 8.0 | gt58ltebmc | SM-T357W |
| Samsung | Galaxy Tab A | gt58ltechn | SM-T355C |
| Samsung | Galaxy Tab A 8.0 | gt58ltetmo | SM-T357T |
| Samsung | Galaxy Tab A 8.0 | gt58wifi | SM-T350 |
| Samsung | Galaxy Tab A 8.0 | gt58wifi | SM-T350X |
| Samsung | Galaxy Tab A 8.0 | gt58wifichn | SM-T350 |
| Samsung | Galaxy Tab A 8.0 | gt58wifichn | SM-T350X |
| Samsung | Galaxy Tab A 9.7 | gt5note10lte | SM-P555 |
| Samsung | Galaxy Tab A | gt5note10lte | SM-P555M |
| Samsung | Galaxy Tab A 9.7 | gt5note10ltechn | SM-P555C |
| Samsung | Galaxy Tab A 9.7 | gt5note10ltehktw | SM-P555Y |
| Samsung | Galaxy Tab A 9.7 | gt5note10ltektt | SM-P555K |
| Samsung | Galaxy Tab A 9.7 | gt5note10ltelgt | SM-P555L |
| Samsung | Galaxy Tab A 9.7 | gt5note10lteskt | SM-P555S |
| Samsung | Galaxy Tab A | gt5note10wifi | SM-P550 |
| Samsung | Galaxy Tab A 9.7 | gt5note10wifi | SM-P550 |
| Samsung | Galaxy Tab A 9.7 | gt5note10wifichn | SM-P550 |
| Samsung | Galaxy Tab A 8.0 | gt5note8lte | SM-P355 |
| Samsung | Galaxy Tab A | gt5note8lte | SM-P355M |
| Samsung | Galaxy Tab A | gt5note8ltechn | SM-P355C |
| Samsung | Galaxy Tab A 8.0 | gt5note8ltechn | SM-P355Y |
| Samsung | Galaxy Tab A 8.0 | gt5note8wifi | SM-P350 |
| Samsung | Galaxy Tab A 8.0 | gt5note8wifichn | SM-P350 |
| Samsung | Galaxy Tab A (2017) | gta2slte | SM-T385 |
| Samsung | Galaxy Tab A (2017) | gta2slte | SM-T385M |
| Samsung | Galaxy Tab A (2017) | gta2sltechn | SM-T385C |
| Samsung | Galaxy Tab A (2017) | gta2sltektt | SM-T385K |
| Samsung | Galaxy Tab A (2017) | gta2sltelgt | SM-T385L |
| Samsung | Galaxy Tab A (2017) | gta2slteskt | SM-T385S |
| Samsung | Galaxy Tab A (2017) | gta2swifi | SM-T380 |
| Samsung | Galaxy Tab A (2017) | gta2swifichn | SM-T380C |
| Samsung | Galaxy Tab A (2018, 10.5) | gta2xllte | SM-T595 |
| Samsung | Galaxy Tab A (2018, 10.5) | gta2xllte | SM-T597 |
| Samsung | Galaxy Tab A (2018, 10.5) | gta2xlltechn | SM-T595C |
| Samsung | Galaxy Tab A (10.5) | gta2xlltecs | SM-T597W |
| Samsung | Galaxy Tab A (2018, 10.5) | gta2xlltekx | SM-T595N |
| Samsung | Galaxy Tab A (10.5") | gta2xlltespr | SM-T597P |
| Samsung | Galaxy Tab A (10.5") | gta2xlltevzw | SM-T597V |
| Samsung | Galaxy Tab A (2018, 10.5) | gta2xlwifi | SM-T590 |
| Samsung | Galaxy Tab A (2018, 10.5) | gta2xlwifichn | SM-T590 |
| Samsung | Galaxy Tab A | gta3xl | SM-T515 |
| Samsung | Galaxy Tab A | gta3xl | SM-T515N |
| Samsung | Galaxy Tab A | gta3xl | SM-T517 |
| Samsung | Galaxy Tab A | gta3xl | SM-T517P |
| Samsung | Galaxy Tab A | gta3xlwifi | SM-T510 |
| Samsung | Galaxy Tab A (8.4", 2020) | gta4s | SM-T307U |
| Samsung | Galaxy Tab A (2016) with S Pen | gtanotexllte | SM-P585 |
| Samsung | Galaxy Tab A (2016) with S Pen | gtanotexllte | SM-P585M |
| Samsung | Galaxy Tab A (2016) with S Pen | gtanotexllte | SM-P585Y |
| Samsung | Galaxy Tab A (2016) with S Pen | gtanotexllte | SM-P587 |
| Samsung | Galaxy Tab A (2016) with S Pen | gtanotexlltechn | SM-P588C |
| Samsung | Galaxy Tab A (2016) with S Pen | gtanotexlltekx | SM-P585N0 |
| Samsung | Galaxy Tab A (2016) with S Pen | gtanotexlwifichn | SM-P583 |
| Samsung | Galaxy Tab A (2016) with S Pen | gtanotexlwifikx | SM-P580 |
| Samsung | Galaxy Tab A 8 | gtaslitelteatt | SM-T387AA |
| Samsung | Galaxy Tab A 8.0 | gtasliteltecs | SM-T387W |
| Samsung | Galaxy Tab A 8 | gtasliteltespr | SM-T387P |
| Samsung | Galaxy Tab A 8 | gtasliteltetmo | SM-T387T |
| Samsung | Galaxy Tab A | gtaslitelteusc | SM-T387R4 |
| Samsung | Galaxy Tab A 8.0 | gtasliteltevzw | SM-T387V |
| Samsung | Galaxy Tab A (2016) | gtaxllte | SM-T585 |
| Samsung | Galaxy Tab A 10.1 | gtaxllte | SM-T585M |
| Samsung | Galaxy Tab A 10.1 | gtaxllte | SM-T587 |
| Samsung | Galaxy Tab A (2016) | gtaxlltechn | SM-T585C |
| Samsung | Galaxy Tab A (2016) | gtaxlltekx | SM-T585N0 |
| Samsung | Galaxy Tab A | gtaxlqltespr | SM-T587P |
| Samsung | Galaxy Tab A (2016) | gtaxlwifi | SM-T580 |
| Samsung | Galaxy Tab A 10.1 | gtaxlwifi | SM-T580X |
| Samsung | Galaxy Tab A (2016) | gtaxlwifichn | SM-T580 |
| Samsung | Galaxy Tab A 10.1 | gtaxlwifichn | SM-T580X |
| Samsung | Galaxy Tab A 7.0 | gtexslte | SM-T285 |
| Samsung | Galaxy Tab A 7.0 | gtexslte | SM-T285M |
| Samsung | Galaxy Tab A 7.0 | gtexslte | SM-T287 |
| Samsung | Galaxy Tab A 7.0 | gtexslteswa | SM-T285YD |
| Samsung | Galaxy Tab A 7.0 | gtexswifi | SM-T280 |
| Samsung | Galaxy Tab A (8.0", 2019) | gto | SM-T295 |
| Samsung | Galaxy Tab A (8.0",2019) | gto | SM-T295 |
| Samsung | Galaxy Tab A (8.0", 2019) | gto | SM-T295C |
| Samsung | Galaxy Tab A (8.0", 2019) | gto | SM-T295N |
| Samsung | Galaxy Tab A (8.0", 2019) | gto | SM-T297 |
| Samsung | Galaxy Tab A (8.0", 2019) | gtowifi | SM-T290 |
| Samsung | Galaxy Tab A Kids Edition | gtowifi | SM-T290 |
| Samsung | Galaxy Tab A with S Pen | wisdom | SM-P205 |
| Samsung | Galaxy Tab A with S Pen | wisdomwifi | SM-P200 |